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Old June 11, 2018, 08:15 PM   #7
Junior Member
Join Date: July 8, 2017
Location: Berkeley, CA
Posts: 14
Just saw this ... sorry it's kinda old. I have a reprint of a 1936 Abercrombie and Fitch catalog; they have a page on Griffin & Howe "sight mountings". The model F403 covers most of the double lever mounts, which are either 22mm or 26mm diameter. They cost $32.50 if they don't have a micrometer wind gage fitted ($35 for the F405 for 22mm, or $37.50 for the F406 for 26mm, if they do have that feature). If your mount doesn't have a micrometer wind gage, it's almost certainly an F403.

There's a single lever mount, the F402, which doesn't have the fancier options and come only for 22mm tubes.

I hope this helps!
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