The 24681 is the assembly number, as Ed noted in his post that you referenced. It shows the frame and yoke (crane) were fitted together at the factory. The "A" may be another fitter's or inspector's stamp.
The stocks are from a 1910-'20 era N frame, and should you want to find originals (smooth walnut, no medallions) they are worth much more than those in trade. Enjoy!
__________________
Alan
SWCA LM 2023, SWHF 220
|