Here are three odd U-numbers -- $8 each or Take all three for $20 plus actual postage.

U-2121 from Czechoslovakia -- inkstamped with the Elekroporcelan Louny EPL logo 1985 - no issues

U-2121 from Germany -- no markings -- no issues

U-1845 from Italy -- dome ink stamped RICHARD GINORI -- cool piece with a copper insert - no issues