@krogoth: what do you think about these: cash cows or appreciable collectibles?
'Liechtenstein - 2022 Crypto Stamp 4.1 - Special Edition Imperforate' https://www.wopa-plus.com/en/stamps/product/&pid=76330 and the
'2022 Crypto Stamp - In Memoriam of Princess Marie of Liechtenstein' stamps? https://www.wopa-plus.com/en/stamps/product/&pid=76332

Limited to 5.000 pieces each but just because there is a qr-code on them makes them not a collectible for me...

@BibiFricotin: you can buy (and wear!) a Copper Membership for the board here https://bitcointalk.org/index.php?action=credit;promote and most restrictions are gone