Clearly the person who sold them to you had no idea either. I've never laid eyes on them but looks like a significant piece of card history. Those would not have been pulled out of packs.A prize or promotional set with Rothmans? Awesome. The Stevens colour card is Scanlens 1977.
I'd like to know the history of them. Were they in packs? As a full set? Did you get one card at a time or several? Did you have to buy a carton of "Roughman's" paying half a lung to acquire the set?. Anyone know how these were distributed?