Sorry Jerry, I don't know of the differences, except for stampings and surface finish.
Since you collect them, how about a photo essay of a few of each era, and maybe the membership can catch the differences and point them out.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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