Postby Aguest » Wed Aug 08, 2018 8:59 am
I believe it is just the center of a "tri-cornered hat" into which the man on the horse would insert his head in order to wear the hat :::
"By the end of the 17th century, the tricorne was popular in both civilian fashion and in military uniforms. They remained one of the predominant European styles of hat throughout the 18th century. In the United States, only the first five Presidents, from George Washington to James Monroe, wore this style of hat according to the fashion of the 18th century. James Monroe earned the nickname "The Last Cocked Hat"[8] because of this."
It would be interesting if it were a greek letter, or a Masonic letter (within the triangle symbol), but at this point I do not think I see a letter there :::