Coat of arms of Dubber

The blazon

lozengy, or and az. on a bend gu. three crescents ar. — Crest, out of a ducal coronet gu. two wings, expanded, ar. each charged, with a bend of the first, thereon three crescents of the second. [Granted, 1623.]

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.