Coat of arms of Grimwood

The blazon

az. a pale ar. surmounted by a chev. or, charged with three mullets of the field. — Crest, on the top of a tower an eagle, issuant, wings endorsed, holding in the beak an acorn, slipped, ppr.

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.