Hi,
Thank you Nicolas for your great report.
I will come back with my own report once I find some time.
I can just say that I've collected all Lange catalogs since 1995 with great interest. I've been amazed for ten years by their work and now I'm finally in love.
I desperately want a Richard Lange! And the Tourbograph is now one of my grail watches (even unfinished as the prototype was)!
I'm in trouble!
Dje