Hi Mike,
I got a chance to look over your response in detail this morning. I'd like to post some completed pics but I haven't got around to working on the gun yet. I took some time this morning to look at the action closer, and I my uninformed WAG is that this is a later gun. The reason I say that is that what I thought was an anodized or blued trigger appears to be plastic, ( or possibly a powdered metal mass produced item ) but I don't have time to look at it further. Here's a couple pics of the two stage trigger.
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You had also asked for a look at the globe sight, so here's a few pics of it.
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And the rear sight
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The breech seal appears to be leather that has been so heavily greased up that is become almost like putty, deteriorated, and no longer of any value. I'll probably turn a synthetic replacement on my lathe.
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And a shot at the markings
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I have to agree with you. I personally favor the Diana 27's over the R-7 as a walkabout plinker. It's got the zip of the HW-50S and it's very light cocking for the power level. A fantastic handler also.
Now it's time to get to work! LOL It's already 10:15 am.
Warm Regards
Keith Knoblauch