RK,
It would be very unusual for the can not to have the manufacturer on it. Without the manufacturer the lot number doesn't mean much. At one time Bill Ricca sent out a sheet with every order for military parts that gave the lot number for each manufacturer when they changed to non-corrosive priming.
The AP does indeed indicate Armor Piercing. This became the standard military issue ammon in WWII as it was effective on lightly armored vehicles and tended to range better than the 150gr. ball ammo. The five round clips were primarily used in the 1903 Springfield and Remington rifles which were still being used early in the war, and the 1903A3 which was manufactured during 1943. To a lesser extent it was used in the Model 1917 and Johnson rifles.
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