You can request a letter from S&W on their website.
Yes
38 Special and 357 Magnum
colt 357
A few hundred to tens of thousands depending on EXACTLY what you have, its condition, accessories, box, papers, history
The very first .357 Magnum cartridge was introduced in 1934 by Smith and Wesson.
The clip will work for either .40 or .357 sig
By the features.
1970
the 357 smith & Wesson 28-3 was introduced in 1982 Made from 1982-1986
No. It is a fatter diameter than .357, and will not fit. The bullet diameter is .361, instead of .357.
The Smith and Wesson 357 model 686-4 is valued somewhere between $450.00 to $625.00, depending on the condition.
Standard catalog of Smith and Wesson by supica and nahas