I've been looking at some photos of an old horn for sale. The owner knows little about it except that it is an Oscar Adler and an alto (originally he advertised it as a tenor). I was a bit stumped when I could not see the 2nd bell key on the other side of the bell. I know it was common back then to have them separated into each side of the bell, but as far as I can tell this one only has one! I'll try to post a photo or two but given my computer is on the blink this may be tricky.