WMF - Supplementary marks for hollow-ware
A = reject item
AA = refuse
as = antique silver finish
B = Britannia-metal
bg = gilt base
brass = export mark
copper = export mark
D.R.P. Deutsches Reichspatent (Imperial German Patent)
ep = electro-plated
gg = entirely gilt
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go = parcel-gilt
ig = gilt interior
I/O = Normal thickness of gilding or silver-plating
M = brass
MB = partly brass, partly Britannia metal
N NS = nickel-silver
O silver-plate deposit, 50% thicker than the normal coating
OX = oxidized
zg = fancy gilt
* = export ware or special production (possibly)
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