Picked up a box of ammo for my NRM

SRG

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Just received this early box of Winchester .357 ammunition to go along with my KCPD Non-Registered Magnum.

Lot# is A59 10 any idea as to the year of manufacture?
 

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That doesn't seem like the usual Winchester date stamp. It usually is all digits:

The first one or two digits are the month, and the next digit is the last digit of the year then a space followed by the day of the month.
Examples:
126 30 = December 30, 1936 or 1946 or 1956
80 23 = August 23, 1930 or 1940

Your box is clearly pre-WWII, so it was probably loaded May 10, 1939. "A" may have been a loading line designation.

Western always used a different alphanumeric dating system, and Winchester changed to the Western system sometime in the late 1950s.
 
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