Stadelmann in Suhl, pinfire double rifle , looks like 20 or 24 ga to me
http://www.lauritz.com/da/auktion/f-stad...alvd/i4724770/#

belgian made combination gun 16 ga pinfire + 14mm pifire rifle, probably a 28 ga

http://egun.de/market/item.php?id=6535378

more basic gun but with a little work and love it could be improved