Antique Matthew West M.W. S.S. E.P. Dutch Girl & Boy Salt & Pepper Shakers

Antique Matthew West M.W. S.S. E.P. Dutch Girl & Boy Salt & Pepper Shakers.
Made of some type of metal and marked with M.W.C. inside an upside down triangle. Girl is 3 1/2", boy is 3 1/4" tall. Picked these up at my favorite resale shop. I've never seen any like them and I think they are adorable! Was wondering if anyone knows anything about the maker, age or what kind of metal they're made of? Thanks.