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My first impression was it was double struck Iraqi

Some photos would help as some wartime production cocking pieces omitted half bent, but where usually replaced as deemed unsafe.

It might be a long shot but try this guys ebay site, he has a few different screw for the AJ Parker Sights
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IMG_20190928_203838.jpg Photo by archmoco | Photobucket

IMG_20191021_211235.jpg Photo by archmoco | Photobucket

I was doing some research on a recent purchase and I came across this post...