The S&W Model 28 "The Highway Patrolman" was produced c. 1954 - 1986 with 8,427 manufactured the first year. There were several variations. The prefix of N was added in 1969. The numbers inside the yoke may help determine appx. yr. ...28 (1957), 28-1 (1960), 28-2 (1961) Hope this helps.
@ 1964-5
Need the serial number to answer the question
1970 to 1972
1975 or so
50-500 USD or so
@ 1976
100-800 USD; can't date without a serial number.
With the serial number that you have provided,your Smith and Wesson model 28-2 Highway Patrolman was made in the year 1973.
1978
50-500 usd
1975-1977
50-460 usd