Vintage Cameo Ware Harker Blue Bowl Stained And Aged With Use

Description

Vintage Cameo Ware Harker Blue Bowl Stained And Aged With Use.
Although the maker mark says “Shell Shape” I don’t see anything shell like about it. Maybe it’s a custard bowl for the same series of pieces that have the shell like rim.
This piece is stained or baked brown where it should be white.