5 5/8 " x 3 3/4"
Lid is marked Bloomfield Industries
Lid unscrews
This and the one below are probably the most contemporary of the flip-tops that saw commercial use.
This one was known as "Bloomfield 90" in the food service catalogues.
In photo below, the same bowl is held in place by a metal band. The seller bought the unit from a old restaurant and said the holder was screwed into the counter.