This is an interesting question. As far as I understand, chopmark is just a method to test if the coin is struck in "good" silver and not plated...
1979 20 kopek unfortunately is a common date. I suspect your 15 kopek is also dated 1978 or 1979. In general, a lot of the higher denomination...
With all honesty - if I didn't read the year on the coin, I thought it was struck within the last decade. WOW.
This might be a good page to start off with: http://hkmal.blogspot.com/2011/02/283-china-yunnan-republic-50-cents-1920.html To my knowledge,...
It's from Yunnan Province. Most 3.6 mace coins are rather uncommon to scarce. The only exception is Yunnan 3.6 mace which happened to be very...
Sometimes a DSLR can be more trouble than its worth if you aren't used to it. You can get a DSLR camera and then you may have to look at micro...
I've posted this a couple of years ago of a list of world mints, national banks and banknote printing press. The original list already had a lot...
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