Bagley registered RDs 790480-482 on 20 February 1934.
RD 790481 was the design for the Empress range of tableware.
I’m not sure whether the dimensions you give are in cm or inches, but the bowl looks like the Empress salad bowl or sugar bowl.
(Incidentally, RD 790480 was for a trumpet-shaped vase with a floral frieze, and RD 790482 was the design for the Wyndham trinket set, vase, clock etc).
Fred