Yes
100-5000 or so depending on EXACTLY what you have.
100-300 USD or so
1970
No such revolver made by S&W
1973. Value $300-$350.
50-350 USD or so depending on condition.
29,900 in good shape
The Smith and Wesson model 36 is a 5 shot J frame revolver with a 2 or 3 inch barrel. Depending on the condition and age, the revolver may be worth 150 to 500 US dollars.
In typical condition, $150-$250
There is no 6866. There is a 686, its value can vary between 100-500 USD
Yes.
50-300 usd