It is an aperture for depth of field. I think it is as so he could see the reticle and not use his glasses?Good clean-up job. Mine is exactly like your's but always kept in excellent shape, SN TM0789. What the heck is that contraption at the rear of the scope?
He is a cool guy, just very much a person that sees these as a tool for a task. Can in some ways see his approach looking back at some the cars I have used as track cars.
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