I've never found any production #s by model, but here is what I do know:
Bisleys intro'd in 1985, and with a few clean out guns, thru as late as 2007.
Standard 32s started in 1984 and went thru 2003 in significant #s and thru 2009 with very little production.
All Bisley barrels 6 ½" or 9 ½":
RB-32 = Fluted cylinder and drift-adj-for-windage-only rear sight - most common
RB-32A = Fluted cylinder and Adjustable rear sight – RARE (one made with extremely rare 5 1/2")
RB-32W = With Engraved cyl and drift-adj-for-windage-only rear sight - RARE
RB-32AW = With Engraved cyl and Adjustable rear sight - most common
RB-32AW = With arrow stamp in error on bottom of cyl frame forward of trigger guard, Engraved cyl, and Adjustable rear sight - EXTREMELY RARE