Id of proof mark

[Missing Something]

Can anyone tell me what this is.....

Looks like a letter C or G under a crown.


Thanks, Craig

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[Badger]

Any chance of getting a more close up look at the mark?

What rifle type and part type is it stamped on?

Thanks...

Regards,
Badger

[tiriaq]

Thompson gun.

[Badger]

Here's perhaps a more close up and clearer views that "missing something" emailed me...

Looks like a British Proof Mark to me....

Regards,
Badger

[green]

Looks like the entwined GP mark of the London Proof House, a commercial proof mark put on after the arms were surplused. This mark appeared on the CA thompsons sold in the 80s.