Very few were made with 4 inch barrels, which is why a letter from S&W to verify would be required unless the original box was available.
In fact there were a few made with a 4 inch (heavy) barrel in the 1971 period. The barrel and rib are a Model 14 profile and distinctly different than the Dayton guns.
Here is a 14-3 s/n 1K32110 with Roy's letter confirming it is a factory special order. The barrel comparison pictures show the Model 14 profile on the left and the Dayton profile on the right.
Russ
edit to add:
here's an earlier discussion of this Model 14-3 4" example:
http://smith-wessonforum.com/s-w-re...ed-barrel-lengths.html?highlight=heavy*barrel
and here's one on special barrel length Model 14s in general:
http://smith-wessonforum.com/s-w-re...-14-4-inch-barrel.html?highlight=heavy*barrel
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