All of the Model of 1989 guns I have seen have been in .45acp, but i do believe I may have heard of some in .45 Colt. Most I have seen are 5 inch barrels. They are in the "N" frame series. The jewelled trigger and hammer indicate custom work, which can be good or bad. The smoothest S&W I ever bought was a mod 629 that had a super slick action, it wouldn't go off though, and cost 200+$ to get the "custom" work undone. If the one you are looking at was done well, it's a bonus, if not, it's a big problem. If it indeed is in .45 Colt, it would be a neat gun, .45 Colt is one of my favorite cartridges.
