They were presumably made in West Germany, most likely some time in the 70s. The material is solid wood. The brand is NOT "Pöhler und Schilling" or "P+S" despite looking very similar. There are no other logos, text or stickers on these things.
Any help is greatly appreciated!
The drivers are in fact different, but the ones in your links are also not matching. Maybe they experimented in the early days of the company or they were customized. I consider this one solved.