50-400 usd
100-300
Call S&W with the serial number, and they will tell you when it left the factory.
661 Million.
661 Million.
There is no S&W with that Model number.
50-500 usd
You need a gunsmith.
nothing, no depends on the shape its in
110.1667
661 is prime.
3√661 ≈ 8.711
661 x 1