Hello, I am not sure which ruler this is, I am almost confiden that it's not Ivan IV. If anyone has an idea of who it is, it would be appreciated. 1 kopeck ~14mm.
Have a look at Ivan IV page 4, coin 25, 26, 27 they have a very similar legend
https://www.metaldetectingworld.com/wire-money/index_4.htm
Update: CraigCoinHunt beat me to it 😀It does seem Ivan IV though: N#111785
Check the drawings of the KG#79 here: https://kyiv2014.com/copeck/8000/3.html , the details are quite similar to yours.
Well, two to one, looks like I was wrong. Thanks for the help.
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