S&W 696 L frame 44 spec or 396 with the centennial hidden hammer. The 696 is a 5 shot mid frame S&W with a short barrel and adjustable sights. S&W has made various runs of the N frames with 2.5" or 3" barrels: in 44 spec- models 24 or 624, in 44 mag - models 29 or 629, or in 45 acp or colt - models 25 or 625. Some runs have had fixed sights but most have had adjustable sights.
Taurus also has had a run of their tracker frame size in 44 spec and 45 acp and colt, these are all 5 shooters.