Oh yeah there can be. Standard size is 2 7/8 x 2 3/8, but I have seen them 1/16 bigger and smaller than that. That's a 1/8" discrepency which is huge. The listed size is just an average. I used to think anything smaller must be trimmed, but that's not the case. Sheet cutting in the factories was anything but an exact science up through the forties and into the fifties.
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Items for sale or trade here UPDATED 3-16-18
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