Just in 1980 as they were seeing what interest there was in different sizes of cards (silly idea to even think about going away from what is now recognized as the standard size).
In 1981, they did put out Promo card sheet of 8 cards. These cards are # the same as the cards in the base set issue. So the sheet would be different but if they are cut into 8 cards, it might be difficult to tell from the base set. The card #s on the sheet were: 82, 83, 93, 94, 104, 105, 115, & 116.
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0