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Perpetual Calendar is best known for its simple design. It shows only the time, date, month and power reserve. It compensates mechanically for the differing number of days in the months, hence the name perpetual. The sapphire crystal case-back reveals the H. Moser HMC 341 movement as well as the leap year cycle.

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The remarkable design of the Endeavour Perpetual Calendar is possible in part due to the ingenious display for the month: this short central arrow hand uses the 12 hour indices to indicate the month. The H. Moser big date display is also very rare in that it is a Flash Calendar, generating the power to change the date in a fraction of a second. This combination of exceptional solutions led the Endeavour Perpetual Calendar to be recognized at the Geneva Watchmaking Grand Prix in the category complicated watch in 2006.

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- Case: diameter 40.8 mm, height 11.1 mm
- Movement: in-house hand-wound calibre HMC 341, diameter: 34.0 mm, height: 5.8 mm
- Frequency: 18,000 vib/h
- Power reserve: minimum 7 days Perpetual Flash Calendar display- Centre hand month indicator
- Hours, minutes and date
- Off-centre seconds dial
- Power-reserve indicator
- Hacking seconds
- Double Pull Crown mechanism
- Double barrel
- Moser teeth for all wheels and pinions
- Interchangeable Moser escapement
- Original Straumann Hairspring with stabilized Breguet overcoil
- Pallet fork and escapement wheel made from gold
- Movement and components hand finished and decorated
- Leap year cycle indicator visible on movement side
- See-through sapphire crystal case-back
- Hand-stitched alligator strap
- Solid gold or platinum folding clasp, with an engraved Moser logo
 
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