Not much but here goes translated
"Manufacturer, former machinery and apparatus GmbH Ascherberg in Holstein
Wagria, former machinery and apparatus GmbH Ascherberg in Holstein (the beginning of the 40-end of the 60s). Inter alia air rifles were also produced.
Known models M50, M55, M56, M58, M59, M60 and M61."
Looks like a pretty decently made gun, and the rarity makes it a definite collector.
http://www.egun.de/market/item.php?id=4554385
Probably the fact that they are so unknown works against them in the value stakes, as no-one really can desire something they do not know even exists! First time for me too.
**WANTED**: WEBLEY PATRIOT MUZZLE END; Any Diana/Original mod.50 parts, especially OPEN SIGHTS