Will vary from a few hundred to a thousand or so in USD depending on age, condition, accessories, box, papers, etc..
Send me your email for a scan of the model 41 manual.
No
Go to Smith and Wesson's website. You can request a manual or download it for free
No
1957 to present.
The Model 57/657
50-1000 usd
Until @ 1978
1972
100-1,368 usd
Still made. Cost in the 1000 USD range.
100-600 USD