250 or so
100-460 or so
You must call S&W. SN goes beyond published data.
Email Smith & Wesson. They keep good records and and usually responsive to questions.
Take it to a gunsmith
100-425 USD or so
I know the 4006 started production in 1990 and still is today. That ser# I don't know.
500 give or take
Call S&W and they will tell you when it left the factory. It could have been made anywhere from a week to a year before.
You can request a manual for free at S&W's web site.
@1990. You will have to call S&W to narrow it down further
Best to ask a gunsmith for help. You can also request a manaul from S&W.