Thanks for all the kind words regarding the set, I sure am lucky to have it :)
I don't have much info on them either, the only thing I got from some German site is that Imperial (which were supposedly made by Oskar Baur) and Giannini were the only drum-makers in Switzerland after the war. Fun fact: they were also constructing typing-machines :))
Aand this is the only set I've seen on the interwebs, although I could have sworn that there was another set on the same site that was more simillar to mine, but i guess it's gone now, probably sold.
http://www.drumsonly.ch/en/02raris.htm
(it's on the bottom of the page)
The drums in general are really musical, they have a wonderful tone to them, it's just the drumheads that don't feel ok to me, kinda bringing the quality back for a notch...I just know that if i put some good heads on them, they'll sound 10 times better, but the pre-international sizes thing is a pain in the behind..
I was looking at stdrums, i presume that the Metrische Felle (http://www.stdrums.de/shop/index.php?cat=c127_Metrische-Felle-metrische-Felle.html) section is what I'm looking for, and I wanted to ask if some of you have used these, some feedback on quality, duration etc etc ?