This thread may have saved another Kiev from the cupboard of forgotten cameras. As soon as I saw those shapes in the bottom left of the negative in the top post, I recognised them from the ones which turned up on some (but not all) of the film I just put through a Kiev 3A.
And after shining a torch through the rangefinder window, yes, a tiny pin-prick of light is coming through that hole in the top sprocket wheel. So I have a project...
Also, the wool/yak hair seal in the groove where the back meets the top, is completely missing, so that's another job.
Hoping that this one will be back to full health soon.