The crossed swords is the proof house view mark. The numbers indicate where, when and by whom the gun was proofed. The Letter on the left indicates the year...a K would be 1959. The 2 is the rank of the inspector...the lower the higher the rank. And the B on the right indicates the Birmingham proof house. The proofing and all the stamps were only done when the gun was released from military to public usage.
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Guy
SWHF #474 SWCA LM#2629
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