Unidentified Flying Panzer Merchandise

I recently did my not-very-regular search of eBay for weird and/or wonderful Panzer items. Among the usual lineup of expensive copies of Saga and fake soundtrack CDs from that seller who makes the most fake-looking soundtrack CDs ever, I found this Japanese auction for a Panzer item that I haven’t seen before.

I’m not sure what it is, and the description (“seal / prize premium”) doesn’t help me much. Does anyone have any ideas? (Maybe just a flier?)

I know the bottom part says “Original Mug Cup” and “Chance Present” meaning it either comes with the Zwei Mug or makes it possible to win ??