It's .327 magnum. Somewhat uncommon because it's new. You may have to order it, but check first with some local gun shops.
The ammunition that it is chambered for.
The 3914 was made in 9mm
100-400 USD or so
200-2000 USD depending on EXACTLY what you have.
100-550 USD
Impossible to do with just the sn.
50-500 usd
62-66. The sn is incorrectly listed. It must have a C in front of it.
1961/62
100-400
Email Smith & Wesson. They keep good records and and usually responsive to questions.
No. .357 Sig and 9mm are two completely different calibers and not interchageable.