English Sterling Silver Pin - Mad Hatter

A recent discovery, what appears to be another pin from the same English maker of the Alice pin I posted about here.

Similar in size to the Alice, this Mad Hatter is 1 5/8 inches tall and is equally well rendered as the Alice.

Similar markings on the back as with the Alice, the name (Mad Hatter) and the hallmark (Ster Silv) and © WDP.  I would love to know how many characters they made, and who the maker was.