Being near BPI I bought a bag of 12 and 16 overshot cards reasonably priced. The idea of punching cards from discarded shell boxes is worth considering. What you need to do now is go to someone that makes rubber stamps and get some made with the shot size so you can imprint them on the OS cards before you insert them over the shot and before you crimp. Try a craft store or a office supply store. I had a set made some years ago and still use them. Makes a nice end product.
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