Use a magnet. If the gun is nickel plated, a magnet will stick to it.
The Model 36 was never produced in stainless steel, just blue and nickel. The serial number indicates 1973-1974 manufacture. sales@countrygunsmith.net
1974
Mid 80s
1969? 1969? 1969?
You will have to call S&W
50- 375 usd
With no other information supplied, 100-500.
Impossible to answer without the serial number. The serial number is on the butt.
50-500 USD or so
You will need to call S&W
200 or so
the gun was made in 1984 it is probably a third generation