Byzantium-large folis 1.

I will need help colleagues. It is definitely Byzantium, a large folis coin, about the eleventh to twelfth century.

Probably copper, although certainly with impurities - it doesn't have green signs of oxidation.

Size and weight:

27,5x22,8 mm

2,51g

I can't identify your Byzantine coins, but can give a couple of websites that might help you  find matches. 

Here are some excellent sites to identify Sasanian coins: 

https://en.numista.com/numisdoc/identification-of-sasanian-coins-186.html

http://beastcoins.com/Sasanian/Sasanian.htm

http://grifterrec.rasmir.com/sasania/sasanian.html

and to identify mints:

https://www.forumancientcoins.com/numiswiki/view.asp?key=Sasanian%20Mints

Colleagues, I tried to take a better picture, and I'll try my luck if someone knows the king. It should be between 1143-1261. I have to fix the metal - it's not copper, it's something like bronze, but everywhere it says billon. And the coins are marked as billon trachy

I have already stated the weight and size for all of them - it is a minor quantity, everything is a large ,trachy billon,,

Try and then I'll look for it and if I don't find it, it'll go to the dustbin of history-(box)

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Thank you very much for any help.

Ivan