What does this 37mm headstamp mean?

[charley777]

Looks like a standard USA M16 case.
37x222R x55.3
But the headstamp seems unusual .... M13 at 12o'clock and GL 1942 at 6o'clock
Can anyone please explain this.
Thanks very much

 

[M8owner]

M13 drill round.

http://www.bocn.co.uk/vbforum/threa...-Cannons?highlight=world's+largest+collection

 

[charley777]

That explains the lack of crimp.
Thanks very much.
Pity the "projectile" is missing.

M8owner your M13 case also has the "G L" ...any ideas what that means?

 

[ron3350]

I have GL listed as made by Guide Lamp Division of General Motors Corp, USA.