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

Vintage Silverplate Serving Utensils EPS England Fork Spoon Fruit Design epns
Vintage Silverplate Serving Utensils EPS England Fork Spoon Fruit Design epns
$5.99
Time Remaining: 46m

SET of SIX VINTAGE SILVER PLATED EPNS SALMON PINK COFFEE BEAN SPOONS
SET of SIX VINTAGE SILVER PLATED EPNS SALMON PINK COFFEE BEAN SPOONS
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Time Remaining: 54m

POOLE SILVER CO VINTAGE 3 PCS VEGETABLE SERVER EPNS
POOLE SILVER CO VINTAGE 3 PCS VEGETABLE SERVER EPNS
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Time Remaining: 1h 35m

VINTAGE TWO HANDLED EPNS SILVER PLATED VEG DISH WITH LID WALKER
VINTAGE TWO HANDLED EPNS SILVER PLATED VEG DISH WITH LID WALKER
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VINTAGE SILVER PLATE 6 GRAPEFRUIT SPOONS EPNS GLEAMING POINTED FLUTED BOWL
VINTAGE SILVER PLATE 6 GRAPEFRUIT SPOONS EPNS GLEAMING POINTED FLUTED BOWL
$25.22 (1 Bid)
Time Remaining: 1h 51m

NSC EPNS Silver Plate 50 Pcs
NSC EPNS Silver Plate 50 Pcs
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Time Remaining: 2h 1m
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Vintage EPNS Preserve Sugar Bowl Spoon 3 3 4
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VINTAGE SILVER PLATED SUGAR SIFTER SIFTING SPOON EPNS
VINTAGE SILVER PLATED SUGAR SIFTER SIFTING SPOON EPNS
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Time Remaining: 2h 20m

6 Pastry Cocktail Hors DOeurves Forks Sheffield England EPNS
6 Pastry Cocktail Hors DOeurves Forks Sheffield England EPNS
$15.00
Time Remaining: 2h 45m

Antique EPNS Knife and Spoon Vintage Serving Pieces for Tea Mother of Pearl
Antique EPNS Knife and Spoon Vintage Serving Pieces for Tea Mother of Pearl
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Time Remaining: 2h 52m
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SMALL SPOONS 4 1 2 IN WITH A MONK PREAST ON END EPNS SET OF 6
SMALL SPOONS 4 1 2 IN WITH A MONK PREAST ON END EPNS SET OF 6
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VINTAGE HEAVY SILVER PLATE 5 DESSERT FORKS EPNS DWTS MARK OLD ENGLISH GLEAMING
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Time Remaining: 3h 11m

Falstaff Silver Plate EPNS Salad Servers Embossed Fruit Pattern
Falstaff Silver Plate EPNS Salad Servers Embossed Fruit Pattern
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Time Remaining: 3h 11m
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VINTAGE HEAVY SILVER PLATE 6 GRAPEFRUIT SPOONS EPNS ALPIN OLD ENGLISH GLEAMING
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Time Remaining: 3h 12m

VINTAGE HEAVY SILVER PLATE 6 TEA SPOONS EPNS DWTS MARK OLD ENGLISH GLEAMING
VINTAGE HEAVY SILVER PLATE 6 TEA SPOONS EPNS DWTS MARK OLD ENGLISH GLEAMING
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Time Remaining: 3h 15m

2 Vintage EPNS Grapefruit Spoons VERY OLD
2 Vintage EPNS Grapefruit Spoons VERY OLD
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Time Remaining: 3h 21m
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EPNS SILVER PLATED FRUIT BASKET BOWL ON PEDESTAL WITH CAST RIM H K IN BASE
EPNS SILVER PLATED FRUIT BASKET BOWL ON PEDESTAL WITH CAST RIM H K IN BASE
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Time Remaining: 3h 26m
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VINTAGE EPNS SILVER PLATED FRUIT BASKET BOWL ON PEDESTAL BY J R
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Time Remaining: 3h 26m
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VINTAGE SILVER PLATE 6 GRAPEFRUIT SPOONS EPNS GLEAMING ART DECO SQUARE ENDS
VINTAGE SILVER PLATE 6 GRAPEFRUIT SPOONS EPNS GLEAMING ART DECO SQUARE ENDS
$21.85
Time Remaining: 3h 33m

VINTAGE SILVER PLATE EPNS PICKLE FORK OLD ENGLISH PATTERN BY ATKIN BROS
VINTAGE SILVER PLATE EPNS PICKLE FORK OLD ENGLISH PATTERN BY ATKIN BROS
$8.39
Time Remaining: 3h 34m

Vintage Wm Rogers  Son Prima NS ALP and EPNS Sweden Spoons w Box 7pc
Vintage Wm Rogers Son Prima NS ALP and EPNS Sweden Spoons w Box 7pc
$10.00
Time Remaining: 3h 58m
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VINTAGE SILVER PLATED ANCORA EPNS FLOWER SUGAR TONGS SNIPS
VINTAGE SILVER PLATED ANCORA EPNS FLOWER SUGAR TONGS SNIPS
$16.81
Time Remaining: 4h 25m
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Ornate EPNS Salad Set Fork  Spoon Sheffield England
Ornate EPNS Salad Set Fork Spoon Sheffield England
$7.15 (2 Bids)
Time Remaining: 4h 27m

SGEngland EPNS A 1 Silverplate Cake Server Pie Utensil 12
SGEngland EPNS A 1 Silverplate Cake Server Pie Utensil 12
$9.99
Time Remaining: 4h 49m
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Early C20th Silver Plated EPNS 2 Pint Hotel Wear Tea Pot
Early C20th Silver Plated EPNS 2 Pint Hotel Wear Tea Pot
$33.65
Time Remaining: 4h 50m

TH Marthinsen WILD ROSE Demitasse Coffee Spoon 4 EPNS Silverplate Norway
TH Marthinsen WILD ROSE Demitasse Coffee Spoon 4 EPNS Silverplate Norway
$0.99 (1 Bid)
Time Remaining: 4h 54m

Ornate Silver Plate Serving Dish National Silver Co EPNS
Ornate Silver Plate Serving Dish National Silver Co EPNS
$5.00
Time Remaining: 4h 57m

Vintage Silverplate EPNS Covered Serving Dish By Silvercraft New York
Vintage Silverplate EPNS Covered Serving Dish By Silvercraft New York
$15.00
Time Remaining: 5h 5m

3 SILVERPLATE GOBLETS EPNS AND MMD ONE NEEDS REPAIR
3 SILVERPLATE GOBLETS EPNS AND MMD ONE NEEDS REPAIR
$5.00
Time Remaining: 5h 18m

Matching Sheffield Silver Plate Spoon  EPNS Sugar Spoon Sheffield England
Matching Sheffield Silver Plate Spoon EPNS Sugar Spoon Sheffield England
$9.99
Time Remaining: 5h 24m

VINTAGE UNKN MAKER SILVER PLATED SUGAR TONGS EPNS SHEFFIELD ENGLAND 4 3 8
VINTAGE UNKN MAKER SILVER PLATED SUGAR TONGS EPNS SHEFFIELD ENGLAND 4 3 8
$35.00
Time Remaining: 5h 33m
Buy It Now for only: $35.00

VINTAGE EUROPEAN HAND MADE EPNS TRAY PLATTER
VINTAGE EUROPEAN HAND MADE EPNS TRAY PLATTER
$80.00
Time Remaining: 5h 43m
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Vintage Sheffield EPNS Electroplate Nickel Silver Clear Glass Panel Cruet Set
Vintage Sheffield EPNS Electroplate Nickel Silver Clear Glass Panel Cruet Set
$50.00
Time Remaining: 6h 3m
Buy It Now for only: $50.00

Vintage Sheffield EPNS Electroplate Nickel Silver Cruet Set in original box
Vintage Sheffield EPNS Electroplate Nickel Silver Cruet Set in original box
$150.00
Time Remaining: 6h 6m
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10 inch engraved plate by Warren Silver Plate Co New York EPNS 0220
10 inch engraved plate by Warren Silver Plate Co New York EPNS 0220
$7.50
Time Remaining: 6h 9m
Buy It Now for only: $17.45

Silver Plated EPNS TONGS Made in Italy Amazing High quality
Silver Plated EPNS TONGS Made in Italy Amazing High quality
$14.99
Time Remaining: 6h 15m

Tall English Silver Plated Mug Made by Unett EPNS
Tall English Silver Plated Mug Made by Unett EPNS
$14.30
Time Remaining: 6h 20m

ORNATE SILVER MEAT SERVING FORK MARKED RETES K EPNS
ORNATE SILVER MEAT SERVING FORK MARKED RETES K EPNS
$42.00
Time Remaining: 6h 28m

Sheffield Design Silverplate Square Platter 0376 HMC EPNS WMMTS
Sheffield Design Silverplate Square Platter 0376 HMC EPNS WMMTS
$2.99
Time Remaining: 6h 29m

Antique EPNS Silverplate Handled Basket J D  Son
Antique EPNS Silverplate Handled Basket J D Son
$65.00
Time Remaining: 6h 44m
Buy It Now for only: $65.00

ANTIQUE c1880 1936 A SILVER EPNS THREE PIECE CONDIMENT SET JB CHATTERLEY
ANTIQUE c1880 1936 A SILVER EPNS THREE PIECE CONDIMENT SET JB CHATTERLEY
$55.55
Time Remaining: 7h 21m

EPNS Vintage Sheffield England Silver Plate Server Cake Tongs C4
EPNS Vintage Sheffield England Silver Plate Server Cake Tongs C4
$20.99
Time Remaining: 7h 28m
Buy It Now for only: $20.99

Antique Vtg National Silver NS Co EPNS 5 Iced Tea Spoons Adam 1917 Silver Plate
Antique Vtg National Silver NS Co EPNS 5 Iced Tea Spoons Adam 1917 Silver Plate
$20.00
Time Remaining: 7h 52m

Antique National Silver EPNS Silverplate Pierced PIE SERVER Early 1900s NSC23
Antique National Silver EPNS Silverplate Pierced PIE SERVER Early 1900s NSC23
$9.99
Time Remaining: 7h 58m
Buy It Now for only: $9.99

National Silver Co EPNS ADAM Pattern Gravy Ladle 1917 Silverplate
National Silver Co EPNS ADAM Pattern Gravy Ladle 1917 Silverplate
$3.00
Time Remaining: 8h 36m
Buy It Now for only: $8.00

LOT OF 12 MS Ltd SHEFFIELD ENGLAND EPNS PASTRY FORKS
LOT OF 12 MS Ltd SHEFFIELD ENGLAND EPNS PASTRY FORKS
$22.95
Time Remaining: 9h 46m

Vintage WA EPNS made in Sheffield England Dinner Party Serving Spoon 10 1 2
Vintage WA EPNS made in Sheffield England Dinner Party Serving Spoon 10 1 2
$15.00
Time Remaining: 9h 56m

9 Viners of Sheffield EPNS Demitasse Spoons
9 Viners of Sheffield EPNS Demitasse Spoons
$6.50
Time Remaining: 10h 2m

Vintage EPNS Silverplate 2 Serving Pieces
Vintage EPNS Silverplate 2 Serving Pieces
$18.95
Time Remaining: 10h 11m
Buy It Now for only: $18.95

Antique EPNS England Silver Plate Basket Pedestal Bowl Handle Pierced
Antique EPNS England Silver Plate Basket Pedestal Bowl Handle Pierced
$65.00
Time Remaining: 10h 31m
Buy It Now for only: $65.00

Vintage EL Fruit Spoon EPNS Silverplate Sheffield England has EL Crown Mark
Vintage EL Fruit Spoon EPNS Silverplate Sheffield England has EL Crown Mark
$5.00
Time Remaining: 10h 33m

SALE MSG MIDDLETOWN SILVERWARE EPNS CONN8910 VINTAGE SILVERPLATED DISH HOLDER
SALE MSG MIDDLETOWN SILVERWARE EPNS CONN8910 VINTAGE SILVERPLATED DISH HOLDER
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Time Remaining: 11h 9m

Benedick 1139 epns silver plated creamer
Benedick 1139 epns silver plated creamer
$4.99
Time Remaining: 11h 26m

vintage cruet set silver Epns parts or repair copper silver
vintage cruet set silver Epns parts or repair copper silver
$9.99
Time Remaining: 11h 29m

Middletown Silver Co Quadruple Plate Silverplate Serving Platter EPNS
Middletown Silver Co Quadruple Plate Silverplate Serving Platter EPNS
$9.95
Time Remaining: 11h 35m

English EPNS Silver Plate Art Deco Dessert Fruit Spoons Set of 2 RD764160
English EPNS Silver Plate Art Deco Dessert Fruit Spoons Set of 2 RD764160
$8.97
Time Remaining: 11h 45m
Buy It Now for only: $8.97

EPNS ENGLAND SET OF 4 SMALL KNIVES RED Handle KNIFE EPNS Nickel Plate Silver
EPNS ENGLAND SET OF 4 SMALL KNIVES RED Handle KNIFE EPNS Nickel Plate Silver
$16.99
Time Remaining: 11h 50m

Vintage European English Salt  Pepper EPNS
Vintage European English Salt Pepper EPNS
$18.95
Time Remaining: 11h 57m
Buy It Now for only: $18.95

Vintage Reed  Barton Silverplated Sauce Boat EPNS
Vintage Reed Barton Silverplated Sauce Boat EPNS
$14.99
Time Remaining: 12h 12m
Buy It Now for only: $14.99

Scarce Victorian Era Silver EPNS Girl with Basket Figural Napkin Ring c1890
Scarce Victorian Era Silver EPNS Girl with Basket Figural Napkin Ring c1890
$185.00
Time Remaining: 12h 15m
Buy It Now for only: $185.00

Plato EPNS Made in England Dish
Plato EPNS Made in England Dish
$5.46
Time Remaining: 12h 20m

Pair of Vintage Antique Art Deco Design VOGUE EPNS Silver Plate Tall Vases
Pair of Vintage Antique Art Deco Design VOGUE EPNS Silver Plate Tall Vases
$23.32 (1 Bid)
Time Remaining: 12h 27m

ANTIQUEEPNS6 SPOON SET FLATWAREMADE IN ENGLANDWITH BOX
ANTIQUEEPNS6 SPOON SET FLATWAREMADE IN ENGLANDWITH BOX
$9.99
Time Remaining: 12h 31m

Antique Victorian EPNS Silverplate Ornate Figural Teapot Indian Head 1881 Rogers
Antique Victorian EPNS Silverplate Ornate Figural Teapot Indian Head 1881 Rogers
$24.95
Time Remaining: 12h 46m

5 Vintage bjs ltd epns spoons
5 Vintage bjs ltd epns spoons
$9.99
Time Remaining: 13h 3m

Leonard Candle Stick Set EPNS
Leonard Candle Stick Set EPNS
$7.99
Time Remaining: 13h 11m

Antique Silverplate Pedestal Foot Gravy Sauce Boat EPNS Nice
Antique Silverplate Pedestal Foot Gravy Sauce Boat EPNS Nice
$10.00
Time Remaining: 13h 17m

1881 Rogers Bros EPNS 418 Silver Plated Floral Serving Tray Dish
1881 Rogers Bros EPNS 418 Silver Plated Floral Serving Tray Dish
$2.99
Time Remaining: 13h 19m

National EPNS Florence 1930s 1 Teaspoon
National EPNS Florence 1930s 1 Teaspoon
$0.99
Time Remaining: 13h 30m
Buy It Now for only: $1.99

Uncommon Sons Of Norway TH Marthinsen EPNS Norway  Oslo 40G Silver PLate Spoons
Uncommon Sons Of Norway TH Marthinsen EPNS Norway Oslo 40G Silver PLate Spoons
$21.00
Time Remaining: 14h 29m

EPNS SILVERPLATE FRUIT SPOONS WA SHEFFIELD ENGLAND IN BOX
EPNS SILVERPLATE FRUIT SPOONS WA SHEFFIELD ENGLAND IN BOX
$20.00
Time Remaining: 14h 43m
Buy It Now for only: $20.00

VINTAGE ART DECO HAND HAMMERED SILVERPLATED COCKTAIL SHAKER FROM MM
VINTAGE ART DECO HAND HAMMERED SILVERPLATED COCKTAIL SHAKER FROM MM
$29.99
Time Remaining: 14h 56m

Vintage Leonard Silverplate Coffee Tea Service Set w EPNS Silent Butler tray
Vintage Leonard Silverplate Coffee Tea Service Set w EPNS Silent Butler tray
$75.00
Time Remaining: 15h 27m

NORITAKE EPNS VINTAGE SILVER PLATED spoon 6 with box nib still in platsic
NORITAKE EPNS VINTAGE SILVER PLATED spoon 6 with box nib still in platsic
$7.95
Time Remaining: 15h 38m

VINTAGE PARAMOUNT SILVER PLATED PEDESTAL BOWL EPNS A1 MAYFLOWER
VINTAGE PARAMOUNT SILVER PLATED PEDESTAL BOWL EPNS A1 MAYFLOWER
$23.41
Time Remaining: 16h 13m

Lemon Fork  Demitasse Spoon EPNS 40 TH Marthinsen Norway Wild Roses 60s
Lemon Fork Demitasse Spoon EPNS 40 TH Marthinsen Norway Wild Roses 60s
$12.50
Time Remaining: 16h 54m
Buy It Now for only: $12.50