M230506a
Crown above some crossed lines set above an initial "U" and "GERMANY".
And then we have a certain paysite which incorrectly states that this mark belonged to K. Steinmann (Tiefenfurt, Silesia). People should really demand their money back.
M230506a
Crown above some crossed lines set above an initial "U" and "GERMANY".
M230506b
Crown above some crossed lines set above an initial "U" above what looks like "OSMO" and "GERMANY".