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Anyone recognize this mark?

Posted: Thu May 30, 2019 4:42 pm
by whitecross
I took in a large lot of 60s, 70s, and 80s pieces recently and three have this mark. Any ideas?

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Re: Anyone recognize this mark?

Posted: Sun Aug 11, 2019 3:28 am
by Traintime
For ref.: possible M-over-Z.