I have a MOD 16-5, blue, K-frame, 6 shot, 4" barrel, target sights, 357 Mag. Have not found much on the internet about it. Serial number AUS XXX, the best I have come up with so far early to mid 70's. The gun is in great condition, no hostler wear, no rust, smooth but used. I got it yesterday at a local gun show only paid $340, I am happy with it. Would like to know more history on the gun.