You can request a manual at the Smith and Wesson web site.
Best to ask a gunsmith for help. Various models and not all strip the same.
have a gunsmith show you. less chance of damage.
A Smith and Wesson 459 (or 5904) 9mm in mint condition and deactivated is worth around £400 currently
You can download or request a manual via mail from the S&W web site
50-450 usd
Follow instructions in the owner's manual. If you don't have one, I suggest you find a gunsmith and ask for help.
Easily plus P. The real answer is to check the manual or take it to a real gun shop to be looked at by a pro. If its in good shape, it will be fine with +P. I've had 2 of the earlier Model 59's and they are great weapons.
The fair retail or trade price for a Model a Uzi 9mm carbine is 1600 dollars US.
Smith and Wesson 9mm Model 39-2 Chrome finish.
see Browning.com (HiPower 9mm) 1977
9mm