Then there’s the matte blue 2.5” Model 19-5’s made for the Connecticut State Police in 1998 that fall in the AYY1xxx range. Even though they are almost identical to the 19-5’s made for DSS, they do have their own product code of 100728.
There are also matte blue DSS guns in the AYY range but they were RB models with a 4” barrel.