YOu can request a manual at the S&W website or ask a gunsmith for help.
A Smith and Wesson 459 (or 5904) 9mm in mint condition and deactivated is worth around £400 currently
The S&W Model 459 was an updated version of the Model 59 with adjustable sights, checkered nylon grips and a squared-off trigger guard with serrations. This model was introduced in 1980 and discontinued in 1988.
50-500 usd
Ask a gunsmith for help.
50-500 usd
In perfect shape...about $1,000.00
Recommend you seek the services of a gunsmith.
25-33 yearws old
50-425 usd
50-450 usd
If you don't have a manual, you will need a good gunsmith
You need to find a firearms instructor.