Are you sure this is the serial number? The serial will be on the very bottom of the butt. Numbers on the frame under the cylinder crane are often factory assembly numbers and not related to the serial. If this is the correct serial my guess would be 1953 or so. If there is a letter J in the serial (amazes me how many people ignore letters in the serial numbers on guns) then 1976 or so. If it was made after 1957 the model number (Mod 36) will be stamped on the frame near the cylinder.
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