Found this small porcelain spool near a CSX line here in Western Kentucky. Mark appears to be a U inside a circle. Can anybody help with markers name. I thought at first it might be made by U.S Electric Porcelain Co. but I found that their mark is a US . Help please and as always thanks for any assistance..Thanks to Dave Fleishman for the following info: Spool was probably made by Universal Clay Products, founded in Sandusky Ohio in 1919.