Hi,
W oval ring (or M oval ring)conjoined in a rectangular frame.

I do not believe it to be a (pseudo) Webster Co. mark and has nothing to do with Webster Co.
To compare see;
http://www.925-1000.com/ax_webster.html

Chinese Mandarin hat bell, enamel, glass finial with typical Chinese symbolism; the bat is a symbol of happiness and joy. The Chinese for bat (fu 蝠) sounds identical to the word for good fortune(fu 福) making bats a popular Chinese rebuses. Five bats together represent the ‘Five Blessings’ (wufu 五福): long life, wealth, health, love of virtue and a peaceful death.

Should call it unknown Chinese factory/retailer/maker's mark.
Peter