Forgive me for writing in English, but my German is pretty bad.
I have gott a Schenkelaars-branded Baritone Saxophone that I would like to know more about. It is almost certainly made by B&S but has Keilwerth key guards, serial number is 11xx and it has a one-piece bell as opposed to the two-piece bell used on Weltklang horns. It sounds pretty good for such a cheap horn, but it needed lots of work to get tit playable - the Low A mechanism had disintegrated and needed to be re-built, the pads were terrile and all needeed replacing, the bow/pigtail was bent and needed pulling into shape and re-soldering. Here are a few photos to show what it looks like now. Ready for touring I reckon.
https://flic.kr/p/2ohub5o
https://flic.kr/p/2ohwFHp
https://flic.kr/p/2ohwhz2
https://flic.kr/p/2ohubai