Welcome to the Forum.

These should be post WW II Magnas, as the prewar K frames were in the 6 digit S/N range when Magnas were introduced in the mid thirties. Unfortunately, S&W usually did NOT stamp the grips with the S/N prefix "S, C, D, K", making it harder to date them.

Can you post pictures?

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John 3:16
WAR EAGLE!