CORRECTION,CORRECTION, CORRECTION:
The HP that I saw (and passed on), but tried to describe a couple of days ago is actually a 28-no dash (not a 28-2, as earlier described); 4-screw, sn S2211xx. Some photos:
Once again, thanks for the correction and sorry for the confusion. Guess the hunt for the first 28-2 and those elusive 28-1's continues. -S2