A Smith and Wesson model 66 stainless steel 4" barrell with no dash after the serial number is one of the earliest year guns. It should have all stainless metal with stainless sights front and rear. Black sights or orange inleted front sight is newer model. A no dash with orginal stocks in very good condition can go between 450 to 850 dollars depending on condition of workings and finish. Stock condition has little effect on value.
Without a serial number, there is no way to answer.
If you go to Smith and Wesson,s sight they should have a service booklet that was issued with this handgun showing proper dis assembly and cleaning procedures.
You will need to buy or find a copy of the Standard Catalog of Smith and Wesson.
Call Smith and Wesoon with the serial number and they will tell you when it left the factory.
Impossible to answer without a detailed description of all markings, caliber, bbl length, grip material, type of action.
You must call S&W to find out.
You must call S&W to find out.
Standard Catalog of Smith and Wesson
You will have to call S&W with the sn to find out.
1855
You must call S&W to find out.
You will have to call S&W with the sn to find out.