British electroplaters used a letter code for their "Plated" wares. The best quality was "A1" or "AI", lower level was "A",

next level was "B", followed by level "C", and the lowest level was "D".
A1 (or AI)= Superior Quality = 32 grams on 12 pieces = 2 2/3 grams per table spoon or table fork
A = Standard Quality = 24 grams on 12 pieces = 2 grams per table spoon or table fork
B1 = Quality code found in a Walker & Hall spoon = meaning unknown
B = Third Quality = 16 grams on 12 pieces = 1 1/3 grams per table spoon or table fork
C = Fourth Quality = 12 grams on 12 pieces = 1 grams per table spoon or table fork
D = Fifth Quality = 6 grams on 12 pieces = 0 1/2 grams per table spoon or table fork
(Example by Barker Brothers, Birmingham, around 1900: courtesy Oskar M. Zurell).