Mystery boat
Several years ago, (late 1960's), members of racing fleets in SE Kansas would add stripes and chevrons to their sails to denote what fleet they were in. If I remember correctly 3 chevrons would indicate an expert sailor in "A" fleet. I do not remember the brand of boats, but they could have been a one-design such as a Star. The Star is a fin keeled boat, and is approx. 23' long. It is an open cockpit, and is steered with a tiller. The mast is set further forward than todays designs, and the jib is a very small blade. The boom extends to the stern of the boat and the jib's hoist is approx. 1/2 the height of the mast.Hope this helps. (Where did you see the boat?)