found something maybe
Found this from another forum you may have already seen this also check the blue book sites may have somthing.
Wischo K.G." is the trade name used by a post W W II, German sporting goods/firearms distributor, by the name of Wilsker & Co. located in the city of Erlangen. Spanish made shotguns were exported all over the world in great quanity, starting in the 1950's.
Many of these guns were made under a cooperative contract. One shop would made the barrels, one the actions, one the stocks and then assembled by yet another shop. Unless they are marked by the makers name has their markings, then it may never be known who made what. Putting it another way, there's no way to tell who made what. Sorry about that.
