Look for these:

Date numbers for a return to the factory are 3 or 4 digits placed on left side of grip frame on the 'toe' stamped vertically or horizontally, and will not match any other stamped #s ex: 3.48 for march 1948, 10.57 for Oct 1957, etc.

Stars by the serial # on the butt indicating factory rework & rework dates declined by early ‘60s, eventually no marks and refinishing was discontinued completely some time ago.

Diamonds are on replaced parts or heel of grip frame for refinish followed by the letters, sometimes in a rectangle, B, N, or S, with an R (for refinish), on 'heel' of left side of grip frame.

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Jim
S&WCA #819