Hello. I’m attempting to identify a marking to determine if it’s silverplate and its possibly history. The marking is on the back of a tray where there is also a sticker with the name “BERIOZKA”, which I believe refers to the name of Russian shops especially set up for tourists. I believe this may be anywhere from the 60s through to the 80s and I’m presuming was purchased in (Soviet) Russia. The set consists of the small round tray and 6 goblets that seem to be silver (or gold?) on the inside but not on the outer part and decorative foot of the goblets. Most goblets bear a mark on their underside (what looks like a number) and 1 does not. Any info you could provide would be greatly appreciated.