Russia 20 kopekcs 1921 - indent strike

One of two errors I found while looking over my stuff. I think it's a particularly strong indent strike with clear remnants of the edge reeds and the typical rim overlap.

Edit: realized the title says 1921 instead of 1931... oopse! =)

 

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so this error is called an indent strike ? how does this exactly occur? please tell me more

 

It happens when the coin doesn't completely exit the die fast enough and part of it gets slammed onto the next coin.