Recently I got a special present from the Austrian Post, which seems to have travelled for a long time to reach me. The only date that is written in the envelope is May 2017.
This is it:
Loyalty Bonus Stamp (issued 2017)
The stamp is exclusively sent to subscribers and collectors who have bought something in the online shop of the Austrian Post during the last year. There is no other way to get it.
Thank You very much Austrian Post! ^___^