Hi
First, the Model 16
is a K-32 Masterpiece. Here's how it plays out.
1. In the early postwar period, S&W introduced the K-32 Masterpiece as a companion to the K-38 and K-22. At that time it had only a
name - K-32 Masterpiece.
2. In the summer of 1957, S&W decided to
add model numbers to the names of various revolvers. The K-32 was given the Model 16 designation, and examples began shipping in 1958. This, then, was the Model 16 K-32 Masterpiece. It had both a name and a number. The Model 16 with no dash number is extremely scarce and we assume few were made.
3. In 1961, the Model 16-2 was released. This was the first three screw Model 16 K-32 Masterpiece. Apparently there were no Model 16-1 revolvers made.
4. In 1967, the Model 16-2 was replaced by the Model 16-3. It had the same engineering change as the Model 14-3 and Model 17-3 (K-38 and K-22, respectively). The change entailed the relocation of the rear sight leaf screw, to avoid flame cutting at the screw location.
5. In 1974, the Model 16 was discontinued. It should be noted that all the Model K-32 Masterpiece revolvers up to that time (model marked or not) were chambered for the .32 S&W Long cartridge.
6. In 1989, the Model 16 was reintroduced as the Model 16-4. However, at this time it was a slightly different animal. It had a full lug barrel, which it had never had before. And, it was chambered for the relatively new .32 H&R Magnum cartridge. Production lasted until 1993.
I hope this brief history helps you.
).
