The number on the butt may be drilled thru by the factory for installation of a lanyard swivel but is re-stamped on the grip frame, under the left stock.
With the serial number that you have provided,your Smith and Wesson model 39-2 was made in 1976-1977.
The serial number range from 199, with 26,898 produced.
Of The Standard Catalog of Smith Wesson and although a reference book shows serial numbers and list s years.
What is the age of a smith and Wesson model 14-4 serial number 22k0636? Correctly formulated request is the main component of success.
Serial on butt is 1018.