I recently acquired 3" heavy barreled model 60 with square butt. The serial prefix is AEW which "the book" says 1984 production. Product code 102304 lists a 3" HB SB as 1988 production. Figuring the product codes go in order, I note that the 2" adjustable sighted model 60-1 for Ashland is product code 102305 produced in 1986. Could the book be incorrect stating a 1988 date? Or could this revolver NOT be a product code 102304, but some other variant? If so, does any one know what it is; meaning who was it made for (e.g.: Jovino, Lew Horton, etc.). And approx how many were made? Thank you.