Trying to put a value on anything with just the limited information provided is hard to do. Value depends on a combination of many factors. You have only provided the most generic description. Without a detailed description to include, finish, barrel length, overall condition, stock material, sights, box, original paperwork and any accessories, only a general estimate can be given. This weapon could be in the 100-10000 USD price range.
value of smith & Wesson model 5906 pistol
No such model number.
100-1200 USD
50-500 usd
100-460 or so
50-500 usd
50-250 usd
Properly referred to as a Smith and Wesson Model 59. 100-400 USD
100-300 USD depending on condition.
100-500 USD or so
100-300 USD depending on condition.
75-550 usd