What were the key moments in your 53 years at IWC? When I joined the repair department as a very young watchmaker, Albert Pellaton was the technical director. He was also an inventor - there is a winding system he invented. I was his assistant. After he made something new, I realised it by [creating] a prototype. We made the first digital display pocket watch, mechanical of course. At that time, we never made complications. Why did IWC start making complicated watches? In the 1970s, quartz watches were coming up. I was working on the most accurate mechanical watches, but such accuracy is nothing compared to quartz. So what could I do? I had to do other things to save the mechanical watch. It was hard. [The number of] our employees came down from 330 to 150. We were only working four days a week, and on the fifth day, I tried to make something new, and started to construct some calendar systems on a pocket watch movement with the date, month, weekday and the moon phase. I created the prototype of this pocket watch, the first complicated watch from IWC. We made a small limited edition of only 100 watches to present at the watch fair. How many did you sell? On the second day of the fair, the 100 pieces were sold out. It was nice. One hundred watches for a watch manufacturer is not a big deal, but it motivated us to continue making complicated, mechanical watches. How did you design the Da Vinci Perpetual Calendar? I continued developing, but on a pocket watch. Since the 1970s, the trend for pocket watches was finished; people wanted wrist watches. I wanted to go one step further and make a perpetual calendar. But the problem was there were already perpetual calendars on the market from other brands. I looked around at what was there and something made me think: I must stop all these push buttons to set the date. I was thinking of a system to make it easy. I worked on this for a few years, without a computer of course. When we changed the design, it had to be completely different. I realised my ideas step by step, and made the prototype. In 1985, we presented the first Da Vinci perpetual calendar. What fascinates you the most about watches? Since I was in a watchmaking school in western Switzerland, I was always fascinated by micromechanics. In the 1970s, after Albert Pellaton retired, I started making watches by myself. I was happy. I could fulfil my desire to make something special. A real watch lover doesn't just buy it to read the time; most IWC customers buy them because they have this emotion and are fascinated by the complicated mechanisms. Can you explain the Portuguese origins of your pocket watches' movements? There was already a Portuguese watch in the 1940s that we made for the Portuguese market. The [Portuguese] wanted the most accurate wrist watch. At that time, the pocket watch movement was more accurate than wrist watches, so we used the pocket watch movement to make a wrist watch.