I don't think it's a Colt's magazine.
Subcontractors mark the magazines with a letter. M = Metalform, C = Checkmate, O = Okay Industries. The Pony didn't show up until after 1970. The G on the bottom of the floorplate has yet to be identified as a genuine Colt's subcontractor and the magazines are thought to be fakes from the far east.
Yeah - who is "G"? I would also suspect it because of the less-than-crisp rampant colt embossing, and the less-than-perfect fit of the base plate to the tube. And the lack of a dimple on the follower is troubling. I'm no expert, but I'd avoid it even if it was genuine Colt. But hey - if it's cheap enough you can swap out followers and springs, and maybe it's a good range mag. (Still suspicious of
all flush 8-rounders, I am)
