I just recently acquired by trade (for a S&W EZ9) a Blackhawk in 45 Colt with the extra 45 ACP cylinder. The gun is new/unfired with all paperwork, brown paper. box & bag for cyl and the warranty Card... But no box. Owner says he has the yellow and black box and will give it to me when he "finds" it...but don't hold out much trust in that. Were the convertibles marked as such? Don't know when made except probably late 70s early 80s. I also guess there is a way to figure that out. Everything seems to be on the net. I'm just not smart 'nuff to find that stuff.