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Silverpalte mark "SP" ???

Posted: Sun Oct 19, 2014 6:33 am
by Qrt.S
Hi
Can anybody verify the use of and/or show me a silverplate mark that would look like "SP" meaning "silverplated". If such a mark exists what would this mark mean in comparison with the common marks as EP, EPNS, CP, OSP etc. Thank you in advance.