Yep, that's pure wool (Reine Schurwolle), and the Flags are Switzerland, France, UK and Norway. I too would say it says 1864 to 1984, and that seems to make sense. I triend to research the company, which reads as L. S. Brinkmann GmbH. All I could find is a Google link to Amazon, which doesn't work but it mentions a book about the 90 years jubilee 1864 - 1954 of a L. S. Brinkmann GmbH Strick- und Wirkwarenfabrik Eschwege - that must be the same company. "Strick- und Wirkwarenfabrik" means knitwear and knitfabric factory, and Eschwege is a city in Hessen, Germany - it lies pretty much at the center of the country. German Wikipedia has a lot of info on Eschwege, but doesn't mention the Brinkmann company among the important industries/factories in the city. On ebay.de there's currently a listing for an old advertising poster of 1930 for the factory - it's not very attractive from a graphic point of view. It basically says that they can produce big quantities, but still test their products for quality. I also found a reference for old advertising stamps, dated ca. 1900-1920, where they advertise for everyday knitwear and also sportswear. Further I found a reference that the factory had 100 employees in 1973. I couldn't find anything further or a current website, so I suspect they closed some time between '84 and now.
Karin