You can request an owner's manual for free from S&W on their web site.
Best left to a gunsmith
You need a gunsmith
better to have a gunsmith assemble it so nothing is broke
Your serial number indicates that your Smith and Wesson model 59 was made in the year 1975.
Best to let a gunsmith do this.
39 holds less rounds then the 59
No
No
Your serial number dates your Smith and Wesson model 59 to the years 1977-1978.
Recommend you ask a gunsmith for assistance.
250-400