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This primer is directly from World War II.
The 45 stamped on the casing stands for 1945, the final year of WWII. During this period, the facility operated under the name Ravenna Ordnance Plant (matching your R O P stamp).
While the factory was reactivated later to supply ammunition for the Korean War, it had been renamed the Ravenna Army Ammunition Plant by that time, and the production dates stamped on components would reflect the 1950s rather than 1945.
