Hello. Good work on the pictures.
I believe that is an early mark used by the Wendell Mfg. Company, Chicago, Illinois.
Founded c.1850. Stopped producing flatware around 1900.
Around 1896 they acquired some of the flatware patterns of the Mauser Mfg. Company.
After c. 1900 they produced mostly badges, medals, and jewelry.
Took over Graffe & Stanek c.1940.
Pat.