My 4th Edition book has "AJD" prefixes in both 1985 & 1986.
1985 – AAV, ACC, ACJ, ADA, ADP, ADZ, AEF, AEH, AEM, AER, AEW, AFB, AFK, AFL, AFN, AFR, AFS, AHA, AHB, AHC, AHJ, AHP, AHS, AHT, AHV, AJB, AJD, AJJ, AJH, ALA, ALB, ALC, ALU, ALV, ALW
1986 – ACE, ACV, AJC, AJD, AJN, AJS, AJT, AJW, AHC, AHU, AJS, ALW, ANA, ANB, ANF, ANK, ANN, ANP, AUB, AUC, AUH, AUM, AUU, AVC, AVT
Supica, Jim; Nahas, Richard. Standard Catalog of Smith & Wesson (Standard Catalog of Smith and Wesson) (p. 491). (Function). Kindle Edition.