S&W model 19 manufacture year?

http://en.wikipedia.org/wiki/Smith_&_Wesson_Model_19

Engineering changes were designated with a "dash-" number after the model number. The engineering changes are as follows:
  • 19 (1957): Stamping of model number.
  • 19-1 (1959): Change extractor rod, right to left-hand thread.
  • 19-2 (1961): Cylinder stop changed, delete triggerguard screw.
    • (1963): Introduce 6" barrel.
    • (1963): 50 manufactured with 2.5" barrel, serial range K544672–K544721.
    • (1966): Introduce 2.5" barrel as standard.
  • 19-3 (1967): Relocation of rear sight leaf screw.
    • (1968): Delete diamond-insert grip.
  • 19-4 (1977): Change gas ring from yoke to cylinder. (Not really an "improvement". It did make it slightly easier to clean if there was heavy leading, but basically was a cost-cutting measure.)
  • 19-5 (1982): Eliminate cylinder counterbore.
 
From the book Standard Catalog of Smith & Wesson, the serail number 53K7### was made in 1978/1979 with 25K0001 to 56K9999 so it must be in 1979.

I hope that will help.
 
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