There's a guy on a website allexperts .com called John Newman - he knows about these clocks and says things like..."the Hermle 340-020 is an 8-day balance wheel movement made in Germany."
http://www.allexperts.com/ep/1747-6751/Clocks-Watches/John-Newman.htm
Try him - he'll probably know...
Peccavi
July 2009