Two sheets of Lucky Luke transfers, separated by a thick plain piece of card, in a sealed plastic packet.
"d'aprés MORRIS et GOSCINNY. Imprimé en Angleterre par Letraset pour BONUX"
Procter & Gamble have had several Letraset promotions (as you can see from the other pages of this article), & their detergent Bonux was particularly well-known for their regular deployment of Free Gifts.
Here is one such.
Picture Credit: The SPLAT Scan Archives
© Tom Vinelott 2023