From what I can tell these two are U-709A. The one on the left is has a wonderful tan glaze with tons of deep 'black' on the front facing side. It is incuse marked up on one ear: 27 SUN. The Value Guide says these are New Lexington products with a flat inner skirt. Both of these pictured insulators do NOT have the flat inner skirt. On the right is a second U-709A in a wonderful 'metallic' tan glaze. It is marked up on one ear 1 31 07 or something similar to that. Very cool, old porcelain insulators!