Boys, didn't you read my above reply`s? I just dug out my T/C Contender to double -double check. It is serial # 13143. It is clearly marked on its original barrel, .45 Colt and under that also stamped .410 in smaller print, (still like new). I HAVE SHOT both .45 colt and .410 shotgun shells in it! It is a kicker in 410. The barrel is octagon and is of small diameter, not a bull barrel, has four small port holes on EACH side of the front sight, has a round tube screwed on the end of the barrel to straighten out the shot that is spun down the rifled barrel. A flat spot on the tube to screw it on and off the barrel with a simple supplied wrench that came with the gun. I believe the gun to be a very early gun, never seen another one with the TC wood case and also has a sliver butt plate that looks to be made to be engraved for presentations. I have pictures of it on photobucket but cant post them here--yet! The gun was used but looked unfired when I bought it around 1969 from the old Pony Express shop in San Fernando Valley.
I will try to figure out how to post a picture of it.