My friend has one. It's an original Series 70. The finish almost looks as if it were spray painted black, (probably not, but it looks like it). But the real funny thing is it has a square trigger guard. The serial number on the frame is 2112XXG70. But on the barrel at the ramp are the numbers 3291158.

He said that he was told it was modified by Colt for military use. I have my doubts. You guys ever see one like this or has someone done a crappy modification on a good Colt?

Pic's would help but it sounds like it's been worked on. Good or bad depends on who did the work.

Quoted: ...He said that he was told it was modified by Colt for military use. I have my doubts. You guys ever see one like this or has someone done a crappy modification on a good Colt?

I’d be very interested in seeing the gun too. The squared trigger guard was very in vogue during the ’60, ’70, and most of the ’80. The modification originated out of the competitions that Jeff Cooper used to organize in Big Bear California. These same competitions being the preface to what is now IPSC. Many shooters used to place their index finger of the support hand on the trigger guard (a practice that is now recognized mostly as bad from) and the squared and often checkered trigger guard was a modification preformed to enhance ones grip on that area. As far as I know Swenson was one of the first (if not the first) pistolsmiths to due this on a wide scale. One will also find them on other makers guns of that era..... Pachmayer Combat Specials, Hoag, early Heinie guns, etc.    

Guys, thank you.

Quoted: Many shooters used to place their index finger of the support hand on the trigger guard (a practice that is now recognized mostly as bad form)

Yeah - I've been told that to.  The days a person who tells me it is bad form can outshoot me will be the day I let them "correct" my form.  It aint happened yet, and my support index finger continues to point forward.