Ask a gunsmith for help.
The 669 was made from 85-88
100-450 or so
100-400 or so depending on condition.
50-500 usd
50-325 usd
Request a manual from S&W or ask a gunsmith for help.
50-300 USD or so
You must contact S&W to get a correct answer.
Go the S&W website and request one.
100-400 USD depending on condition, box, accessories, paperwork, etc..
o-500 USD