I agree fully with ThomasGalloway's assessment of use/availability.
The primary purchaser original of these card sheets would be print shops who had the equipment to print/cut the sheets for mailings by the end users.
It would be useful if the Scott Specialized catalog noted which cards were available in sheets.
Here are some sheets:
UX27, certainly the workhorse card of its era, sheet of 40 with Guthrie, Oklahoma roller cancel.

UX42, sheet of 20 with the press-printed revaluing

UX120 sheet of 40 with 40 different handstamps from c1989. This card being the "definitive" workhorse card of its era. (Behind glass in a frame so a bit of light reflection.)
