By the features.
The Model 19 is a 357 Magnum
Standard catalog of Smith and Wesson by supica and nahas
The Smith and Wesson 357 model 686-4 is valued somewhere between $450.00 to $625.00, depending on the condition.
357 Magnum
the 357 smith & Wesson 28-3 was introduced in 1982 Made from 1982-1986
50-550 usd
No
About $450.
N frame 357 Magnum
All Smith and Wesson model 686 revolvers were made as double action handguns by Smith and Wesson.
The Smith and Wesson model 19-5 was made from 1982-1987.
Call S&W and they will tell you.