The s&w catalog 4th ed is a fantastic book, however I have two revolvers where I can not find definitively the year of manufacture, so I'm enlisting yalls help please. The first one is a model 13-3. 3" round butt. AYV****. I can NOT find that alpha combo in it. I'm guessing 1987-88. The next one is a model 29-5 classic with 8 3/8" BNF****. Same thing, I can not find that combo of letters, again guessing 1989-91. Any help please. Just doing records and I want the correct years of manufacture. Thanks in advance! And yes I'm 1000% positive those are the letter combos.