Fully blued, with a sandblasted baseplate, marked "COLT 45 AUTO" along with a prancing horse symbol. Unfortunately a lot of cheap gun show mags are similarly marked. The sandblasted bottom is usually the tip-off.
Thanks for the reply DSK.
The pre seventy Natioinal Match came with a blued mag with a sandblasted bottom plate marked Colt .45 Auto with no prancing horse. The Series seventy GC came with a blued mag with the bottom plate the same finish as the mag body and marked Colt .45 Auto. It also has a "C" on the upper right corner where you would normally find the "M" (Metalform?) in current Colt mags. Are any of these mags correct?