Unknown marking on gas cylinder?

[Garandy]

Seen under rear bottom flat of SA 1944 gas cylinder, just behind stacking swivel boss, at rear bottom.."W", or "M"?
Seen before?

[Chief]

Is this an SA cylinder? Is it a wide base or narrow? Is there a dimple on the right hand side just behind the stacking swivel screw? Are there any marks on the top flat area, or the bayonet lug? Most probably an inspectors mark or a code to indicate finish type.
regards,
Chief

[poof]

i have that identical stamp on rear top of gas cylinder.. Just oppisite of yours. and points to but of rifle also looks like incomplete (W). it sits on an IHC rifle
J.P

[Garandy]

Cylinder is wide base, I believe SA.
I never noted a dimple, but I will attach more pics

[Garandy]

[Garandy]

[Garandy]

I have these marks on my 1941 and 1942 though..."O", and "&"
Andy

[poof]

Picture..almost looks like the same punch made the two stamps..