Here's a note to all the prognosticators who think they can put dates, down to the month, on target sight K frame revolvers in the postwar period. Usually, that is predicated on how far into a particular K range the gun's serial number is.
In 1980, all the K serial numbers from 57K to 68K, as well as a bunch of numbers from 78K and above, were assigned to revolvers. These were not used in order! If they had been, it would have been awfully tough for a 67K gun to have been purchased at retail in March, 1980.
So, the next time you or someone else posts a K prefix number, and someone says, "June or July, 1977," or something like that. Just ignore it. Unless it is Don or Roy (who have direct access to the records), the person simply does not know what he's talking about. He's guessing.