From a pocket guide of Winchester dates of manufacture first edition, 1981-84.
In 1941 s/n 752044 was the start number with no amount of production listed. This is the last year listed. After 1932 serial numbers were chosen at random and many numbers were skipped.
The highest serial number recorded is 849100.
Total production was counted in 1944 at 764215.So it looks like yours
would be between 1941 and 1944. Hope this helps.
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