44.
1991-1999
Yes.
No
No way to accurately answer without the serial number.
Smith and Wesson began listing serial numbers in 1984 with a three letter prefix to there serial numbers.So you should be able to identify the year of manufacture by the 3 letter prefix and then the following number.Smith and Wesson began production of the model 4046 in 1991,and discontinued this model in 1999.The Smith and Wesson model 4046 Tactical was made from 2000-2002.I hope you find this of interest.
100-425 USD or so depending on specifics
100-350 or so
100-300 USD
Recommend you ask a gunsmith for assistance.
Best left to a trained gunsmith.
Want ad, for sale ad, estate sale, garage sale, on line auctions, pawn shop, gun shop, gun show.