This teaspoon appears to bear the mark of the Wendell Manufacturing Co. of Chicago, IL c. 1885, which then ceased production c. 1900According to one source: Wendell Manufacturing Co. roots could be traced back to the year 1885 as Wendell & Co. Wendell & Co. was founded by Maurice Wendell in Chicago, IL. The company manufactured jewelry. However in the year 1890, Wendell Manufacturing Co. was formed to focused on the design and production of sterling silver flatware and ho...llow-ware. In the late 1890s, the silversmith acquired some Mauser Manufacturing Co. dies.This teaspoon is marked STERLING and it weighs 24.15 grams. Unknown pattern but a website that sells lots of replacement flatware calls it WND6.There is a script single letter monogram (L?) on the front side of the handle.