There were two ranges of four Rub-Ons each:
Interestingly, "Rub-Ons" was a trademark of Hasbro at the time, even though dry rub-down transfers were Letraset's own invention, & still under patent. Hasbro Rub-Ons had been hugely inferior up to this point, since they basically consisted of smudges of ink printed onto waxy paper. This is discussed in detail in our article about Hasbro & Topps. The range of Rub-Ons illustrated here represented Letraset & Hasbro coming to an accord.
Rub-Ons were the same format & sheet size as Fun Doodles & Storytime Doodles, etc., with the background consisting of the most basic possible arrangement (other than unfolded): a sheet of card with a single fold.
All four sets in this range shared the same serial number. We don't have the "Scooby Doo" set yet, so the Scooby Doo images shown here are by courtesy of Austin Hale.
If you look carefully at the upper right-hand edge of the sheet above, you can just make out the title of the fourth in the range: "Scooby Doo".
Picture Credit: The SPLAT Scan Archives — Austin Hale
© Tom Vinelott 2020