George,
The grips would be numbered in pencil. So look again in different kinds of light.
The bomb points to later final approval.
So, how did it get the grooved hammer if not assembled early?
A real puzzler.
If it was a late built gun, the grips could be original. They sure look like they are fitted to that frame.
That's a nice gun. Drop me a PM about what we discussed before you bought it.
