It roughly translates to:

Dive into the world of numismatic and digital collectibles.
This unique set combines the fascinating crypto stamp "digitalization" with the curresponding 25€ silver-niobium coin.

Don't take my word, but here is what I heard:
There will be 5000 sets, containing one silver coin + one stamp. Each set will be priced at 121,40€ (roughly $130 USD).
Both, stamp and coin will have a corresponding NFT token.

It will be available for purchase on their website on March 12th: https://shop.crypto.post.at/
(not affiliated or anything just thought I'd share this news while I finally check the forum again)

Which blockchain or how exactly this "corresponding NFT" will be stored on the items is not know (yet). Probably in a similar way to previous Austrian Crypto Stamps.

So long.