This flag was made by the Sons of Liberty and named after Taunton, Massachusetts. It is also the current city flag of Taunton, Massachusetts.
The reason it has the King's Colours in the canton is that they simply re-appropriated a British Red Ensign.
The flag is 3'x5' and made from a premium 100 denier polyester. It has a white header with two grommets. There are four rows of stitches on the fly and two rows on the top, bottom, and header side. The image is screen printed and appears on both sides. Writing will be reversed on the back.
3'x5' flags are 3 feet x 5 feet, 36 inches by 60 inches, 91 cm by 152 cm, 1 yard by 1.7 yards. This is the most common size flag you see hanging on porches, small flag poles, hanging at festivals, and inside of bars and restaurants.