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pay checks puzzle

Posted: Mon Jun 15, 2020 6:33 pm
by elby
Hi
I'm new to the forum and not sure I picked the correct forum,but here goes.I have quite a big collection of brass "pay checks" and I was sorting them out and realized there was sets of 3 of the same number one with a segment cut off,one oval,and one round (see attchd photo), can anyone explain their use please?
Thanks