642
1982
45 years old
You will have to call S&W
Made in 1953. Model Numbers did not come into use unitl @ 1957. Sounds like you have a Chief Special Airweight. Later numbered as a Model 37.
69-70
@ 1979
100-500 USD
My serial # is near yours and I purchased it new in 1968.
@ 58-59 years old
There is a problem with your question. The Model 36 is a standard weight J frame. The Airweight verison was a Model 37. J frame serial numbers were all numbers until 1969. The serial number you list is for a fixed sight K frame made in the 1961-1962 time frame. That would be a Model 12 Military and Police Airweight.
Up unitl @ 1957 model numbers were not used. Check inside the frame near the crane, it has a model number, it will be there.
probably 1961