Oh, how you will laugh. Or else. It is the law. So anyway, it turns out that while for years after having acquired this artefact I had assumed it was related to Cusson's Imperial Leather soap, it seems a more plausible origin is Flan Imperial — a popular brand in France. So this is technically in the wrong article; it should be under 'Free Gift Transfers in Food Promotions'.
I suppose I'm going to have to sort that out eventually…
Still, at least you get to see what it looks like, right?
Picture Credit: The SPLAT Scan Archives
© Tom Vinelott 2020