Comport means to agree with....so I am sure it's not a "comport"...more likely a compote....which is a dish of cooked fruits.
Asiatic pheasant was made by many English potterys and the marks were similar....usually a sort of swirl, the words Asiatic pheasant and the pottery name or initials in a space below the swirl.
Never saw a mark on the side of a piece.
How about a picture of the whole dish and a close up of the mark in question.