Was the sawtooth balance incapable of adjusting to accuracy (design failure) or was there simply a cumbersome issue with ongoing adjustments of the balance itself? I've read both hypotheses. I can't imagine how the watch would be produced (whatever the small number was made with the sawtooth) only to find out mid-production that the time keeping was not accurate or the balance was literally incapable of accuracy. Does anyone have any information? I started thinking as I saw an old thread here of Van Woerd's personal chronograph, which I believe had the sawtooth balance. So he must've adjusted it well enough to use it and rely on its timekeeping. Why else keep it in the watch. Thank you.