My neighbor who's the retired Fire Chief of Edgefield, SC brought one over just like it several years ago that his wife's father had brought back from the PTO after the war. It was missing a few parts since it was found disassembled in the attic but like yourself, I shopped/found the missing parts, cleaned it up, assembled it and test fired it. It doesn't look quite as good as yours but he and the wife were very pleased to have it "restored" since it's a bit of a family heirloom.
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You have to wonder just how many items like this are in attics and basements all over the state of South Carolina. It was one big military installation during WWII with Army, Army Air Corps, Navy and Marine bases including the infamous Paris Island recruit training depot. All of the families here had relatives who served in at least one theater or both! I scoped one Type 38 that had been sporterized many years ago for a USMC WWII veteran who lived back towards town. He killed deer with it into his late 80's and died a few yeas ago in his early 90's.