This year marks the 20th anniversary of the creation of Sonic the Hedgehog. And nothing says "old, possibly dead but worth a token remembrance anyway" like commemorative postage stamps.
Making things even less exciting is the fact they're from Belgium.
At €4.99, you're paying €1 per stamp, so whatever it is you're sending in there, make it count!
Sonic fans interested in picking the pack up, you can get them online at Bpost's store.