Coat of arms of Dumbleton

The blazon

gu. a canton or, surmounted by a bend erm. betw. two lions, rampant, of the second. — Crest, an eagle, displayed, per pale, erm. and errainois. [Granted to Thomas Damhleton, of London, 1759.]

A blazon is the description of a coat of arms in the technical language of heraldry. The drawing comes from that text, and from nothing else.