Dreyse 11mm Double Rifle - what did I buy? centerfire or needle gun?

This came up for sale - I like unusual double rifles, so I bought it. But now I'm hoping its not a needle-gun. I won't have it in hand for a couple weeks. Meantime, Can anyone here tell me what I bought. If centerfire, how does it work? What cartridge would it shoot? Any idea when it was made?

https://www.buckstix.com/buckpics/dreyse11mm-000.jpg