I'm new at this and can't find this marking- it's on the bottom of both mustache cup and saucer. It's a W inside of a star in the middle of a spiderweb. It says quadruple plate at the top and the number 16 on the bottom. Thanks in advance!
It belongs to one of the various partnerships involving Elizur G. Webster between 1865 and 1928; which exactly has never been settled to any satisfaction.