3 Rubles The 150th Anniversary of the first Russian Post Stamp

Here is the page for the coin:
https://en.numista.com/catalogue/pieces79973.html

I have a question about the gold amount on this coin, since on the catalog page there is only mentioned gold plating. Yet there is (I think) credible information directly on the coin, that it has embedded 1/20 ounces (1,55 g) of .999 gold. That actually makes this coin bimetal and it's bullion value is much higher (since only silver is being valued right now). Nevertheless I'd like to ask you about this, because I might be wrong and this coin might have plating only without any significant gold amount on it.

If my assumption is correct, propably more russian coins will need some changes in the catalog.

Here's a better picture of the gold part:

It does look like it's 1.55g of .999 gold. I can't make sense of the total weight of 36.77g though. 31.1g of .925 silver would be 33.62g for the silver alloy part plus 1.55g for gold for a total of 35.17g. There's 1.6g unaccounted for.

Citeer: "rsirian1"​Here's a better picture of the gold part:
​
​It does look like it's 1.55g of .999 gold. I can't make sense of the total weight of 36.77g though. 31.1g of .925 silver would be 33.62g for the silver alloy part plus 1.55g for gold for a total of 35.17g. There's 1.6g unaccounted for.

Thank you for the picture.

​Perhaps silver composition is not quite accurate? I want to buy this coin (I've found an interesting offer for approx. 125$ or approx. 500 PLN), but before I do make a purchase I need to be certain, that it will hold its value due to gold part of this coin. I wonder if someone did check this coin at some dealer shop.

Or maybe:
1. someone measured it wrong
2. there is actually more silver then only one full ounce of pure silver

1. Maybe but I found 3 sellers on ebay stating the same total weight, unless everyone is copying from the same (wrong) source.
2. Maybe or maybe more gold than 1.55g.

Citeer: "rsirian1"​1. Maybe but I found 3 sellers on ebay stating the same total weight, unless everyone is copying from the same (wrong) source.
​2. Maybe or maybe more gold than 1.55g.

​I asked this seller to send me photo with weight of the coin on it. I wonder what it will show up.

I think the difference means metall purity or metall amount tolerance. The official web page of the coin claims that Fine metal content not less than, g 31.10 1.55

https://www.cbr.ru/eng/cash_circulation/memorable_coins/coins_base/ShowCoins/?cat_num=5611-0003

You can send your question here: https://www.cbr.ru/eng/reception/

Citeer: "Grinya"​I think the difference means metall purity or metall amount tolerance. The official web page of the coin claims that Fine metal content not less than, g 31.10 1.55
​
​https://www.cbr.ru/eng/cash_circulation/memorable_coins/coins_base/ShowCoins/?cat_num=5611-0003
​
​You can send your question here: https://www.cbr.ru/eng/reception/

​Thank you, I wrote to Central Bank of Russia. I wonder what they will reply.

GrinyaI think the difference means metall purity or metall amount tolerance. The official web page of the coin claims that Fine metal content not less than, g 31.10 1.55

https://www.cbr.ru/eng/cash_circulation/memorable_coins/coins_base/ShowCoins/?cat_num=5611-0003

You can send your question here: https://www.cbr.ru/eng/reception/

Answer from 17th January:

We  would like to thank you for your enquiry of 21 December 2021. The information on the Bank of Russia’s website was revised according to the coin’s technical specifications.

 

So no clue why it is measured that way.