What does the FPNS & SPNS Stand For on a Silver Piece?

I have several pieces of different silver (bowls, baskets, jugs) all marked with either EPNS, FPNS, or SPNS. What do these stand for? Thanks!

EPNS stands for Electro Plated Nickel Silver
(http://www.acronymfinder.com/acronym.aspx?rec={8DF9F7D9-89E8-11D4-8351-00C04FC2C2BF})

I can't find FPNS or SPNS. Possibly the "F" and initial "S" are actually "E"s?

hth

H 6 X SILVER PLATED EPNS COFFEE SPOONS 11cm
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ANTIQUE SILVER PLATE ELKINGTON TRAY SHEFFIELD ATKIN EPNS TEA POT KETTLE STAND x
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CELLULOID HANDLE 12 PIECE CUTLERY SERVING BOXED SET 6 KNIVES 6 FORKS VTG EPNS
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ANTIQUE BOXED CUTLERY G BROS LONDON EPNS SUPERB FREE UK POST
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VINTAGE APOLLO EPNS SHOT GLASS HOLDER with SHOT GLASS
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ANTIQUE NSC EPNS SILVERPLATE 1 ICE TEA SPOON
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Vintage SILVER PLATED EPNS 2 COASTERS + Unique HOLDER CADDY TRAY
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Lovely Silverplate Pitcher EPNS 1023 Antique
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Time Remaining: 2h 54m
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Vintage EPNS Lot of 2 Salad Forks Unkown Pattern
Vintage EPNS Lot of 2 Salad Forks Unkown Pattern
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National Silver Co Lot of 2 EPNS Baby Forks Unknown Pattern
National Silver Co Lot of 2 EPNS Baby Forks Unknown Pattern
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Sheffield England MSLtd EPNS Pastry Forks
Sheffield England MSLtd EPNS Pastry Forks
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Time Remaining: 3h 30m

VINTAGE BOXED ART DECO DESSERT FORK  SPOON SLACK  BARLOW SILVERPRIDE EPNS A1
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Time Remaining: 3h 55m
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VINTAGE SILVER PLATE EPNS BREAD FORK WITH CREAM COLOUR HANDLE
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VINTAGE SILVER PLATE EPNS PICKLE FORK WITH CREAM COLOUR HANDLE
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Vintage EPNS Silverplate Tea pot 7 x 8 X 6 dia from England
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VINTAGE SILVER PLATE EPNS PICKLE FORK
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Set of 2 EL Sheffield England EPNS Grapefruit Spoons
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Time Remaining: 4h 52m
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EPNS SILVER PLATED 4 PIECE TEA SET INDIA TWO TEA POTS CREAMER SUGAR ALL MARKED
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Vintage EPNS Silver Bakelite Dinner Knives Original Presentation Box Yellow Set
Vintage EPNS Silver Bakelite Dinner Knives Original Presentation Box Yellow Set
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Time Remaining: 5h 12m

Vintage Lot of 2 MS Ltd EPNS Loxley Pastry Fork Sheffield England 5 Long
Vintage Lot of 2 MS Ltd EPNS Loxley Pastry Fork Sheffield England 5 Long
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Time Remaining: 5h 39m
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Pair of Silver plated EPNS Footed Sweet Dishes
Pair of Silver plated EPNS Footed Sweet Dishes
$18.49
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LOT 6 MS LTD EPNS SHEFFIELD ENGLAND ICE CREAM SPOONS SILVERPLATE LOXLEY PATTERN
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Time Remaining: 6h 9m

Vintage EPNS Silver Plate Forked Serving Spoon 95 Excellent Condition
Vintage EPNS Silver Plate Forked Serving Spoon 95 Excellent Condition
$4.99
Time Remaining: 6h 9m
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4 VINTAGE SILVERPLATED EPERGNE INSERTS EPNS
4 VINTAGE SILVERPLATED EPERGNE INSERTS EPNS
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Time Remaining: 6h 19m

Nice Vintage Boxed Set of 6 EPNS Silverplated Fish Forks Bergil Good Shape
Nice Vintage Boxed Set of 6 EPNS Silverplated Fish Forks Bergil Good Shape
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Time Remaining: 6h 20m

ANTIQUE ART NOUVEAU SILVER PLATED 12 PIECE KNIFE  FORK SET IN BOX EPNS A11900S
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$50.00
Time Remaining: 6h 34m
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Antique Vintage BIRKS EPNS PLATE 9 Diameter SILVER CUT OUT DISH Charger Platter
Antique Vintage BIRKS EPNS PLATE 9 Diameter SILVER CUT OUT DISH Charger Platter
$49.00
Time Remaining: 6h 46m
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25Pc SILVERWARE LOT Rogers Smith Sullivan Gorham EPNS Rogers Brothers Fork Tea
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$65.00
Time Remaining: 7h 18m
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Benedict Indestructo glass bowl with EPNS silverplated lid
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Vintage Large Silver Serving Spoons 3 Sheffield England EPNS
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Time Remaining: 7h 47m

ANTIQUE H SAMUEL LTD EPNS SHEFFIELD SILVERPLATE INDIVIDUAL BUTTER KNIFE EXCL
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Time Remaining: 7h 59m

Sugar Creamer Set Cheltenham England EPNS Silverplate w Stand Holder
Sugar Creamer Set Cheltenham England EPNS Silverplate w Stand Holder
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Time Remaining: 8h 12m

Set of 6 EPNS England Silver Plated Napkin Rings
Set of 6 EPNS England Silver Plated Napkin Rings
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Time Remaining: 8h 44m
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19thC Imari Mustard Pepper Salt Set EPNS Silver England
19thC Imari Mustard Pepper Salt Set EPNS Silver England
$186.95
Time Remaining: 8h 50m
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HUGE OAK CASED ANTIQUE SILVER EPNS 1840S CUTLERY SET OVER 70 PIECES WITH KEYS
HUGE OAK CASED ANTIQUE SILVER EPNS 1840S CUTLERY SET OVER 70 PIECES WITH KEYS
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Time Remaining: 8h 56m
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EPNS Decorative Spoon with Glass Handle
EPNS Decorative Spoon with Glass Handle
$30.00
Time Remaining: 8h 57m
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Apostle spoons Silver Plate x 6 marked EPNS
Apostle spoons Silver Plate x 6 marked EPNS
$3.38 (3 Bids)
Time Remaining: 9h 45m

Antique EPNS Tea Spoons Silverplated Sheffield England With Box Art Deco
Antique EPNS Tea Spoons Silverplated Sheffield England With Box Art Deco
$19.99
Time Remaining: 10h 21m
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6 Vintage DEMITASSE SPOONS Expresso SILVERPLATE EPNS Bearded Man Handles
6 Vintage DEMITASSE SPOONS Expresso SILVERPLATE EPNS Bearded Man Handles
$74.95
Time Remaining: 11h 1m
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Antique Bakelite Bread Knife Engraved Blade EPNS Free Shipping
Antique Bakelite Bread Knife Engraved Blade EPNS Free Shipping
$49.99
Time Remaining: 11h 7m
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VINTAGE ENGRAVED SUGAR TONG epns silverplate AD
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$19.99
Time Remaining: 11h 10m
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silver cordial elegance epns wares india 375 in tall set of 6 never used old
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Time Remaining: 11h 10m
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Antique Spoon NSC EPNS serving spoon ladle
Antique Spoon NSC EPNS serving spoon ladle
$3.99
Time Remaining: 11h 47m

2 EPNS India Silver Plated Goblets Cups
2 EPNS India Silver Plated Goblets Cups
$20.00
Time Remaining: 11h 57m

9 Salad Spoons Tongs EPNS Sheffield England
9 Salad Spoons Tongs EPNS Sheffield England
$7.99
Time Remaining: 12h 17m
Buy It Now for only: $14.99

Vintage Old English Candy Dish by Poole Silver Co EPNS Item 5004
Vintage Old English Candy Dish by Poole Silver Co EPNS Item 5004
$20.00
Time Remaining: 12h 48m
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Reed and Barton EPNS Silverplate Gravy Boat  10042
Reed and Barton EPNS Silverplate Gravy Boat 10042
$23.00
Time Remaining: 13h 2m
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Reed  Barton EPNS 230 Silver Platter
Reed Barton EPNS 230 Silver Platter
$17.99
Time Remaining: 13h 8m
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Vintage Silver Plated Large Spoon Rest Bowl Made in India EPNS
Vintage Silver Plated Large Spoon Rest Bowl Made in India EPNS
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Time Remaining: 13h 35m

Silver Plate 5 Pieces EPNS
Silver Plate 5 Pieces EPNS
$14.99
Time Remaining: 13h 36m

Vintage Set of 6 Sheffield England EPNS Spoons w Org Case Gold
Vintage Set of 6 Sheffield England EPNS Spoons w Org Case Gold
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Time Remaining: 13h 46m

Antique Silver Plated M M Co EPNS Tea Pot Water Pitcher Hallmark 975 Victorian
Antique Silver Plated M M Co EPNS Tea Pot Water Pitcher Hallmark 975 Victorian
$33.00
Time Remaining: 14h 29m
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EPNS SILVER  BONE FISH KNIVES  FORKS SET OF 12 ANTIQUE ORIGINAL PACKAGING
EPNS SILVER BONE FISH KNIVES FORKS SET OF 12 ANTIQUE ORIGINAL PACKAGING
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Time Remaining: 15h

Antique Leonard EPNS Silver Trophy Champaine Ice Bucket
Antique Leonard EPNS Silver Trophy Champaine Ice Bucket
$20.00
Time Remaining: 15h 31m
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EPNS Sheffield England EISENBERG LOZANO Silverplate Cheese Serving Set Shell
EPNS Sheffield England EISENBERG LOZANO Silverplate Cheese Serving Set Shell
$9.99
Time Remaining: 15h 52m
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SILVERTONE SILVER PLATE ENGRAVABLE IRISH REPUBLIC EPNS 45 INCH SOUVENIR SPOON
SILVERTONE SILVER PLATE ENGRAVABLE IRISH REPUBLIC EPNS 45 INCH SOUVENIR SPOON
$24.99
Time Remaining: 16h 9m
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Sheffield England Silverplate EPNS Sugar Tongs and Sugar Spoon
Sheffield England Silverplate EPNS Sugar Tongs and Sugar Spoon
$24.95
Time Remaining: 16h 19m
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Set of 6 EPNS Cake forks
Set of 6 EPNS Cake forks
$13.31
Time Remaining: 16h 23m
Buy It Now for only: $13.31

RARE Sheffield Carving Set The Kings Pattern GOLD PLATED EPNS A1 England
RARE Sheffield Carving Set The Kings Pattern GOLD PLATED EPNS A1 England
$29.00
Time Remaining: 17h 19m
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RARE Sheffield Serving FORK The Kings Pattern GOLD PLATED EPNS A1 England 8
RARE Sheffield Serving FORK The Kings Pattern GOLD PLATED EPNS A1 England 8
$15.00
Time Remaining: 17h 25m
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5 x A1 Silver Plated Sandringham Pattern Dinner Forks 80 DWTS PER DOZ EPNS A1
5 x A1 Silver Plated Sandringham Pattern Dinner Forks 80 DWTS PER DOZ EPNS A1
$109.26
Time Remaining: 18h 58m
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6 x A1 Silver Plated Sandringham Pattern Dessert Forks 15 DWTS PER DOZ EPNS A1
6 x A1 Silver Plated Sandringham Pattern Dessert Forks 15 DWTS PER DOZ EPNS A1
$109.26
Time Remaining: 18h 58m
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Pair of A1 Silver Plated Sandringham Pattern Spoons 15 DWTS PER DOZ EPNS A1
Pair of A1 Silver Plated Sandringham Pattern Spoons 15 DWTS PER DOZ EPNS A1
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Time Remaining: 18h 59m
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EPNS MUFFIN DISH OF LIDDED TUREEN BY HB  H ENGLAND
EPNS MUFFIN DISH OF LIDDED TUREEN BY HB H ENGLAND
$33.60
Time Remaining: 19h 25m
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3 Vintage EPNS pieces including Newcraft
3 Vintage EPNS pieces including Newcraft
$15.41
Time Remaining: 19h 59m
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SILVER PLATE VINTAGE PAIR OF CAKE OR PASTRY SERVERS SLICE  FORK EPNS ART DECo
SILVER PLATE VINTAGE PAIR OF CAKE OR PASTRY SERVERS SLICE FORK EPNS ART DECo
$16.79
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VINTAGE SILVER PLATED BREAD FORK SMALL BORDER EGE PATTERN EPNS
VINTAGE SILVER PLATED BREAD FORK SMALL BORDER EGE PATTERN EPNS
$8.39 (1 Bid)
Time Remaining: 21h 40m

VINTAGE EPNS SILVER PLATED BREAD BASKET ON PEDESTAL
VINTAGE EPNS SILVER PLATED BREAD BASKET ON PEDESTAL
$50.41
Time Remaining: 22h 9m
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VINTAGE EPNS SILVER PLATED FRUIT BASKET ON PEDESTAL
VINTAGE EPNS SILVER PLATED FRUIT BASKET ON PEDESTAL
$50.41
Time Remaining: 22h 9m
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Vintage EPNS made in England Seving Spoon and Fork
Vintage EPNS made in England Seving Spoon and Fork
$2.99
Time Remaining: 22h 31m

Vintage ASHBERRY Philip  Sons EPNS A1 7109 tea pot Aladdin shape w Bakelite
Vintage ASHBERRY Philip Sons EPNS A1 7109 tea pot Aladdin shape w Bakelite
$14.00
Time Remaining: 23h 30m

EPNS SIGNED SERVER MADE IN ENGLAND
EPNS SIGNED SERVER MADE IN ENGLAND
$9.99
Time Remaining: 23h 45m
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Silver Repousse Rim Silver Plate Ornate Footed EPNS Middletown Silverware Co
Silver Repousse Rim Silver Plate Ornate Footed EPNS Middletown Silverware Co
$59.95
Time Remaining: 23h 51m
Buy It Now for only: $59.95

6 Miniature Goblets w Etched Decorations on Sides EPNS
6 Miniature Goblets w Etched Decorations on Sides EPNS
$62.83
Time Remaining: 1d 55m
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VINTAGE SILVER PLATE EPNS BUTTER KNIFE WITH STAG HORN HANDLE 775 INCHES
VINTAGE SILVER PLATE EPNS BUTTER KNIFE WITH STAG HORN HANDLE 775 INCHES
$16.79
Time Remaining: 1d 1h 9m