States Line Hotel China Dish

 States Line Hotel China Plate with symbol of a Sea Horse

I am thinking this restaurant grade china is ship related.
6 3/8" diameter ... a bread plate
Backstamp STERLING Vitrified China
East Lliverpool Ohio
USA
L1 ., I think this is a date code

According to the internet.,

L1 is the date code for maybe July-Sept of 1974? for STERLING China company

a search on "States Line" returned several hits including.......

United States Lines operated cargo services from 1921 to 1989, and ocean liners until 1969—most famously, the SS United States and the Leviathan.

United States Lines was the trade name of an organization of the United States Shipping Board (USSB), Emergency Fleet Corporation (EFC) created to operate German liners seized by the United States in 1917. The ships were owned by the USSB and all finances of the line were controlled by the EFC.