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Welcome to the forums from the Wiregrass! There are some dichotomies in your serial number, Model number and physical configuration of your revolver. Our reference bible is the Standard Catalog of S&W by Supica and Nahas, 4th Edition. While it has a substantial database of serials, those after S&W began the alpha numeric numbers around 1980 are not complete. Your serial prefix of ACW is not listed. However, prefixes after ACW are listed in 1983 and just prior in 1986. The Model 15-4 had a pinned barrel which was eliminated with manufacture of the Model 15-5 in 1982. If your gun is a Model 15-4, it is a "transition gun." S&W is notorious for using every scrap of production. So, if it was made in 1983 as Customer Service says, it was probably a frame that didn't get used before the barrel pin was eliminated.
Take a picture of the inside of the yoke area in front of the cylinder with the cylinder open. It should say MOD 15-4 there if that's what it is.
Take a picture of the inside of the yoke area in front of the cylinder with the cylinder open. It should say MOD 15-4 there if that's what it is.
