The information is from the Massachusetts Historical Society who have the William Heath papers. This concerns his brigade in April/May 1776 and provides some interesting information concerning facing colors and standards for the Continental line regiments in his brigade.
"Two standards for each regiment and four colours to each regiment for the Grand Divisions, the First Standard to be the reunion throughout. The Second to be the colour of the facings of the regiment with the following motto.
7th Regiment Col. Wm. Prescott, red, white field, black thorn bush, flesh coloured hand extended to pluck it up, motto: "He that touches one shall prick his fingers."
16th Regiment Col. Paul Dudley Sargent, red, white field.
18th Regiment Col. Edmund Phinney, black (crossed out) buff.
24th Regiment Col. John Greaton, buff, red field, white thorn bush, flesh coloured hand extended to pluck it, motto: the same as the 7th Regiment.
26th Regiment Loami Baldwin Colonel, straw color. "
So, what might this flag have looked like? I have used this image of one of the Gostelowe flags as an example. The center device is very similar to that description turn The 7th and 24th Regiments. This flag, and others from the Gostelowe flag series are available from" League of Augusberg" at a very reasonable price. These are highly useful and very colorful. I have used a number of them in my 1776 regiments.
The illustration at the top of the page is from a similar printed version of the flag scalable for sale for 25mm figures produced by The League of Augsburg:
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