I hadn't been back to this thread for six years....thanks for reviving it! I learned a lot about these fine revolvers in reading through....for instance that the WSP didn't do most of the engraving. I recall being down at Fleet & Supply in the late 70s and seeing the engraving equipment. One of the armorers showed me the rack of Thompsons back there. I can't recall if these were marked, I think I was too awestruck by seeing a dozen or so in one place!

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Even older, even crankier....