Hello Sorry for the late reply - went abroad all this while. You certainly have a real treasure there - I'll keep it within the family if I were you. They don't make enough of these watches nowadays and there will be a lot of people who'll like to buy it from you. Patek skeletons - Wow!
Karl Sartori - He's the highly respected German mathematician and clock maker. Just locate my friend Gerhard Enzi (another authority on precision regulators in Austria) and he will give you all the info you ever need.
Hello Kong There was this clock with the same number serial number 09 but its price was way too high and being only a month runner I gave up the idea.. My current regulator by Karl Sartori runs for 3 months and has a similar Invar pendulum. Not bad for a 100 year old clock. Erwin Sattler's clocks ar