Many years ago when I was living in England and wrote for a different helicopter magazine, I was given a watch by the owners of a small company that had made a very nice two person helicopter. (No names, but they didn't ever mass produce the helicopter.) The helicopter was nice, but not the fastest around the block in terms of cruise speed.
The watch is very nice, and very reliable, and I remember being very impressed with it when I opened the box on the airline flight home. It looked like it was a stopwatch, but closer examination showed the extra two bezels were for changing date and day of the week.
But there was a fourth hand on the main dial. Closer examination showed this hand to be a 'week of the year' hand. Different - and then I thought - I know this helicopter isn't that fast, but Week of the Year???