Hi,
to be more exact, Uniropa wasn't a German company, but just a brand name of "Quelle" a German department store, as you can guess from that "Q" in the low left corner..
Quelle, in the 60s, sold under the name "Uniropa", some Jouef sets, but not Egger..in theory, if you look at the underside of the cars, you should read "Jouef" or "Jouef for Playcraft", and that means that material was produced in France and later sold in Germany in a different box ..it's a quite common set in Germany, a lot more common than the other H0 set branded under the same name and that for someone was produced in Switzerland, for some others in Hong Kong..
Also, for what is in my knowledge, these sets weren't sold in the stores but you had to place an order and receive them later by mail..
david