Jean Neef in Germany has put together an excellent archive of GUB, Urofa and Lange watches produced prior to 1985. Not only are there pictures of watches and their movements, but also detailed information on the technical data and production dates and numbers. All those of you interested in the predecessors of the GO cal. 10-30 and cal. 39, will certainly like this website. You find it here:
It is in German only, but this should pose no serious problem: The pics need no translation, and most of the data are self-explaining. If someone needs assistance with the translation, however, just ask me.