@ Concordia CA [#8]
@ petzlaff [#10]

Hallo,

Jürgen hatte mit seiner Vermutung recht.

Michael Roberts von MEPSI gab mir diese Antwort:

I think it is a piece of paper glued over that place. I really think that there was a logo or address underneath that was obsolete and thus covered by this paper and stamp.

Schönes Wochenende,

Harald