The 686-3 was introduced in 1992 from the 686 which was made in 1988.
You will have to call S&W with the sn to find out.
1980
All Smith and Wesson model 686 revolvers were made as double action handguns by Smith and Wesson.
You will have to call S&W
Shipped in the early 80s
No sn provided
$100.00
Your smith and Wesson model 686 is valued at 250-425 dollars depending on condition.
The Smith and Wesson 357 model 686-4 is valued somewhere between $450.00 to $625.00, depending on the condition.
No engineering changes.
50-550 usd