This pair of signals look just great with their scuffs, grime, and line wire abrasions. I am unsure of the U number of the one on the left, but the one on the right looks like a U-243. The colors aren't quite correct, in spite of my attempt to 'correct' them. The left one is a light gray, and the one on the right is a pale blue/gray. Very neat insulators with evidence of hard lives!