Those appear to be the original "smooth" service stocks that the revolver left the factory with, but have been (rather well laid-out but lightly cut) skip-line checkered. If you check the inside, right grip panel, the serial number might be there in hand written pencil. You will need good light to see it.
SWCA #3050, NRA Life, SCV
Last edited by jebstuart; 04-21-2017 at 10:40 AM.