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<p>[QUOTE=&quot;wesdavidson, post: 586816, member: 18646&quot;]Oh well, sorry, but here is my take on it. </p><p>&nbsp;&nbsp; </p><p>&nbsp;&nbsp; Looks like the imprint of a 5/16 inch socket head cap screw. </p><p><br /></p><p>&nbsp; Just made one and compared it to the one one to the pic, might be wrong on the size, could be metric, but it seems to match, also on yours there seems to be a faint hex shape on the inside of the circle, matches the&nbsp; hex key socket. Most of the bolts&nbsp; have a makers mark, &quot;U&#039; would possibly stand for &quot;unbrako&quot;. </p><p>&nbsp; </p><p>&nbsp;It could have happened in the mint, if they follow standard machine shop practice. but pennies get used for shims in machine shops all the time, the cheapest copper washer you can get is a punched penny.&nbsp;&nbsp; </p><p><br /></p><p>&nbsp;&nbsp; &nbsp; This is where provenence comes in. If it were found in a mint wrapped roll, with witnesses, with the facing coins bearing matching toning, then it would&nbsp; be better. </p><p><br /></p><p>&nbsp;&nbsp; &nbsp; Thanks for finding and posting it, I think many valuable pieces get tossed just couse they ain&#039;t purty.[/QUOTE]</p><p><br /></p>

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