Apart from the re-pointing that is.
The ad looks to be Edwardian and shows the shopkeeper on the left calling the customer on the right to come back. This was beautifully painted as per some of the old Gillette ads and Army Club and other figurative signs.
Here ia a leaflet from iside one of the soap packets that I found here :
|Soap packet leaflet
I can find almost nothing about this product or the manufacturer. It seems that the company was affiliated or bought out in the 20s as the name then changed to Knight (Hustler Soap) which I assume to be John Knight of the Primrose Soap Works in Newham, London, maker of Royal Primrose Soap and Knight's Castile soap.
If you have any more info, do let me know.