Has anyone seen a dish like this before? I know J-D made spark plugs as well as insulators. A dish that was made either as an advertising item or as a presentation to an employee or someone connected with the company.

Reads as follows W. C. Thayer J-D [monogram] Jeffery-Dewitt Co. Detroit, Mich

March 23.1918.

Here is a close-up of the markings [id=151870186]

Approx 6" x 3 1/2"