An ultra-long power reserve watch
is a timepiece designed to run for an exceptionally long time without
requiring winding or movement. These watches are prized by collectors
and enthusiasts for their engineering sophistication and practicality,
especially for those who rotate watches frequently or don’t wear them
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Key Features of Ultra-Long Power Reserve Watches
Extended Power Reserve (7+ Days)
Most mechanical watches have a power reserve of 38–72 hours, but ultra-long models can last 7 days to several months (or even years in some cases).
Some manual-wind watches achieve this with multiple mainspring barrels, while automatic versions use efficient winding systems.
High-Efficiency Movements
Brands like Panerai (P.5000), IWC (Caliber 52000), and Hublot (MP-05 LaFerrari) use twin or triple mainspring barrels to store more energy.
Jaeger-LeCoultre Geophysic Perpetual and A. Lange & Söhne Lange 31 (31-day reserve) use constant-force mechanisms to maintain accuracy.
Specialized Materials & Engineering
Silicon escapements reduce friction, improving efficiency.
Longer, more flexible mainsprings store more energy without excessive tension.
Indication of Power Reserve
Many models include a power reserve indicator (subdial or linear scale) to show remaining energy.