No way to answer without the serial number
You will have to call s&w to find out.
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.
You can download or request one for free at S&W's website.
100-450 USD or so
Contact S&W for an owners manual. Too long to reproduce here.
1981
You will have to call S&W
Late 1966 or early 1967.
Your smith and Wesson model 63 was first made in 1977.
Call S&W and they will tell you.
72-73
You will have to call S&W to find out.