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It should be marked on the barrel.
With the serial number that you provided,your Smith and Wesson model 28-2 was made in the year 1973.
Age of smith Wesson serial no 5K4166
What is the caliber, barrel length, finish, grip material, markings on barrel?
The best that I can do is say that the smith and wesson model 28-2 was made by smith and wesson from 1961-1969.
80's or so
1967
Your Smith and Wesson model 10 was made between 1982-1983,with the 3 letter prefix to your serial number.
c.1982
Need to know caliber, barrel length, and type of action.
Late 80s
1983 or so