Now this is very odd, because I cant track down Leo Chambers except for in an art site where it says he was born in 1800, has no date of death, and has something to do with Algeria, a place that must contain the fountain of eternal life if he really is 221 years old! Yet he is not only a very talented artist, but well known enough at that time that his name appears in the title.
The second oddity is that the cards are not only advertising for Moustafa Ltd, but for Spratt`s dog food, a different combination at the bottom of each text. I suppose when you think about it, if someone liked dog cards, they liked dogs, and the dogs liked eating, so it was good associated advertising, but how did it work? Did Spratt`s pay a contribution towards the production of the set?