Well the reverse isn't "textbook" and the seller states that it is a Zimmerman example "L/52" so the best we can do is see if somebody else out there in Internet land has a Zimmerman badge to post so we can look at the fronts of both.
I got a L52 but it's a screwback like the rest I've on files. The pics on the site are very small and blowing them up don't help anything, so it's hard to compare.
Wondering where the mm is btw, can't see it on the pics. On the screwbacks it's sitting low on the 6 o'clock arm, which is covered here?
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