I'm in doubt if I should answer since everything important is said.
The "annulli" is from a bank in Regensburg (Bayerische Vereinsbank), which now belongs to UniCredit.
(so the topic of this thread is Italy, not Germania

"Scheckstempel" is a tax, you need to pay (at that times), when you give check to the bank, to get the money.
=> it is a fiscal stamp - in a fiscal (no postal) use.
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Sorry for writing english. My Italian is not good enough to write Italian. So if somebody translate it - if nessessary - its fine with me. (No need to answer in english. Reading Italian is a lot easier than writing it.
I had 7 years Latin at school (and the links to google translate) ...
Visit http://www.bollatrice.de The german site on Italian Machine Cancels