I know it isn't as old as shaving soap, but when did shaving cream become a thing?
What a beautiful find! Thanks for posting the picture.
I have a feeling the London perfumes were selling them in the 19th century but I don't have a source to hand. Don't forget these creams though are just soaps with a higher water content.The first "true" shaving creams would have to follow World War I and the discovery of synthetic detergents such as triethanolamine. Anything labeled a "cream" before that, such as Cella, would actually be a soft soap.
That does help give me a clue, thanks.