OK Rogue12153, I did not do too good, but here is what I found in the "Book". The Model 66-1 looks like 1981, 19-2 was made between 1961-1966, could not find a KJF prefix in my book, and the 5906 was made between 1989-1999. I did not show a K prefix in my book for the 5906. Now if the K7108xx ser. number belongs to the 19-2 it would make sense and would be a 1966 production gun. It looks like all the auto pistols had 3 letters and then the number, I think the shrouded rear sight indicates a early model as Novak type sites were on the later ones. I hope this helps some and good hunting for these poor rescue projects. May you be blessed in your endeavors. Bill
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