This is another pair of unmarked blue porcelain insulators attributed to Jeffery-Dewitt. The one on the left seems to be a U-683. It is a sorta bland piece, but in blue it is just fine! It has one inner skirt. The one on the right is a U-866. It is a cool little style. Looks like it should be bigger than 4 3/8" tall! Next up: Suspensions?!