Nice Colt...
Never seen a dimple like that on the side of the rear sight?
Also, .45 Match barrel...
It almost looks like the hammer was lightly bobbed at one point? (I can't really tell as I don't have a frame of reference on-hand)
Offhand...between $600-$1200 depending, probably closer to $800/$1000...
Too bad my new driver's license won't be with me for another couple weeks, otherwise I'd take a stab at buying it from you (can't get a Permit to Purchase here without a valid DL, and I just moved..)
Looks like a well-cared-for piece.
HTH
ETA: Looking closer at the photos, yep, hammer looks bobbed. Also it looks like it might have an aftermarket extractor, possibly slide stop as well. (Can't really tell)
I'll revise my price...$600-$800. As a shooter, it'd be a great one. It'd make a great project gun, too.
How's the barrel? Any frosting? Lands/grooves good/not worn to nothing/etc? Any pitting anywhere?