Well Hartmut,
That is actually quite easy!
I don't know if you live near France.
Go to France the 14 juillet/July (day of the French revolution) and almost all France is one big store of junk and very beautifull stuff.
go there and you will find everything you wish.
bought there a few years ago (2007) a pile (12) Landeron and Valjoux chrono's for about 35 Euro's.....
even an Universal (goldenshadow microrotor) white gold for just 70 euro's, well sold that one offcourse. (sold it to my brother b-), no big money made there b-))
and what to think of other nice Empire clocks etc....
It is worth a try! Don't go near the borders as there are more people around France's neigbours who know this ofcourse HAHAHA
O yea: French speaking helps A LOT!!!
regards,
RJ van Mellee