I believe that the first adjustable rear sights on Winchesters were the stamped type 3 starting in spring 44, mixed with type 1s as available. I have a 5.6 (3/44) that is thought to have the original sight on it, it is a type 3 Hemphill and it covers the name so well that for a decade or so I didn't even know it was a Winchester. My 5.4 Inland has the original Type 2 PI sight, barrel date 8-44.
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