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2. Fusee (horology) - Wikipedia

   en.wikipedia.org/wiki/Fusee_(horology)

   When the mainspring is wound up (Fig. 1), all the chain is wrapped around the fusee from bottom to top, and the end going to the barrel comes off the narrow top end of the fusee. So the strong pull of the wound up mainspring is applied to the small end of the fusee, and the torque on the fusee is reduced by the small lever arm of the fusee radius.

3. Automatic watch - Wikipedia

   en.wikipedia.org/wiki/Automatic_watch

   The next development for automatic watches came in 1948 from Eterna Watch. To wind a watch effectively, one of the chief requirements of a rotor is heft. Until this point, the best bearing used in any watch was a jewel bearing, which perfectly suits the small gears of a watch. A rotor, on the other hand, requires a different solution.

4. Mechanical watch - Wikipedia

   en.wikipedia.org/wiki/Mechanical_watch

   The hand-winding movement of a Russian watch. A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves.

5. List of most expensive watches sold at auction - Wikipedia

   en.wikipedia.org/wiki/List_of_most_expensive...

   Finally, any auctioned watch without public online records from auctioneers (e.g. major auction houses) will not be included in the ranking. As of December 2022, the most expensive watch (and wristwatch) ever sold at auction is the Patek Philippe Grandmaster Chime Ref. 6300A-010, fetching US$31.19 million (31,000,000 CHF) in Geneva on 9 ...

6. Movement (clockwork) - Wikipedia

   en.wikipedia.org/wiki/Movement_(clockwork)

   Mechanical movements get dirty and the lubricants dry up, so they must periodically be disassembled, cleaned, and lubricated. One source recommends servicing intervals of: 3–5 years for watches, 15–20 years for grandfather clocks , 10–15 years for wall or mantel clocks , 15–20 years for anniversary clocks , and 7 years for cuckoo clocks ...

7. List of ETA Movements - Wikipedia

   en.wikipedia.org/wiki/List_of_ETA_Movements

   2540 (manual wind, sweep-second, 17 jewels, 21600vph, reserve 44h) 2550 (automatic, sweep-second, 17/21/23 jewels, 21600vph, reserve 42h)