Nick,
While this discussion is located here, may I ask you if you are looking for any commercial Royal uprights from 1992 and earlier?
Here's the list:
606 (circa 1966 to 1987) = same cast headlight as model 801
606A (circa 1966 to 1976) = same flip-top headlight as model 880
608 (circa 1972 to 1987) = same flip-top headlight as model 880
611 (circa 1972 to 1987) = blanked-out headlight space
618 (1984 to 1987) = first wide-track (18" long) Royal commercial ever made
620 (1984 to 1987) = like 618 but with headlight
660, 662 (1987 to 1990) = replaced 611 and 606 respectively
680, 682 (1987 to 1990) = like 660/662 but with wide-track (18") nozzle. Replaced 618/620
670, 672 (1990 to 1995) = replaced 660/662
671, 673 (1990 to 1995) = like 670/672 but with rubber belt cover and Au-Toe-Matic (toe touch) height adjuster
690, 692 (1990 to 1995) = replaced 680/682
691, 693 (1990 to 1995) = like 690/692 but with rubber belt cover and Au-Toe-Matic (toe touch) height adjuster
All of these could have been optioned with either shake-out bags or with zippered bags for disposables. The latter would have a "Z" at the end of its model # (e.g. 606AZ, 660Z, 670Z), although that wasn't made explicit on the nameplate until 1990.
~Ben
