I agree with Ed Tinker... Definitely aftermarket, but good quality... wish I could remember who made them with that concentric circle follower button, but unfortunately, I can't. maybe LugerDoc can remember... he's a couple of years younger than me 
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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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