I am not sure if it is the oldest but I bet it is close. I have a Taurus model 80 with the 4" barrel in 38 special. I also have the original box and tag that came with the gun as well as the brush. The slip says in Spanish calibre 38 special, Cano 101 mm 4", Modelo Standard, Acabamento: Oxid. When I called Taurus with the serial number to find out when my revolver was made I was told that it's too old to be in the computer and because of a fire in their office back in the 70s or so they might not be able to find out when my revolver was made. It does look exactly like a S&W from the 50s and it's a 5 screw model with the ejection rod exposed and it has a pinned barrel as well. I was told by the guy I bought it from that it was a police trade in and most of the time it was hanging around in a holster which is why almost all of the bluing wear is on one side. I think it had a minor trigger job, mostly smoothing and polishing because it has the sweetest trigger on any of my revolvers. It functions perfectly and has almost no wear in the barrel so I bet I have shot it more than the original owner. It's very accurate and with its tapered barrel it's one of my favorites.
Sent from my SM-J700P using Tapatalk