G. HOLBROOK COAT OF ARMS.
Two designs are known to be "official" for Holbrook. The first was that of Sir Richard de Holbrook whose design was simply a chevron of red on a gold field.
His son, Sir John de Holbrook, had the same design with the addition of 10 crosses crosslet, gold. Both men are shown in the Suffolk line chart.
The original purpose of a Coat of Arms and Crest was identification of the person who was enclosed in armor. It was common at this time for each person to have their own design, and the design variation between Richard and John above is typical.
It was not until later that the idea of a single design, which was to travel down the generations, came into being. This caused the creation of a College of Arms, whose job it was to register designs to ensure that they had not been previously issued to others, and to prevent unauthorized people from claiming arms. The King would send Harolds on Visitations (as late as the 1600's) to inquire in local areas as to who claimed the right to arms and their descent. Many of these Visitations exist today.