Reservoir Hydrosphere Collection

Style - 9616 views -
7 votes 1 Star
Reservoir Hydrosphere Collection

Inspired by a depth gauge, the Hydrosphere collection are jump hour watches. The hour indication is a digit displayed through the 6 o’clock window. The digit readout changes automatically every hour. Also, when the minutes hand reaches the 60 marker, it automatically jumps to the zero marker.

Instead of seconds hand, there is a small disc on the center of the dial that turns to the right with each second that passes. Below the hour window there is a power-reserve indicator, up to 37 hours.

Reservoir Hydrosphere Greg Lecoeur
Reservoir Hydrosphere Greg Lecoeur limited edition with bronzw case and blue dial.

Jump hour watches are nothing new. They were patented back in 1882 by Josef Pallweber. In the Hydrosphere, these complications are implemented with a proprietary 124-pieces module installed on a good old Swiss ETA 2824-2 movement.

The hydrosphere is a diver with helium valve, water-resistant to 250 meters and a unidirectional ceramic rotating bezel with dual scales for reading dive-time at different depth. Cases are 45mm in stainless steal or bronze. Crystal is AR-coated sapphire crystal.

Last but not least, the package includes a rubber and a ZULU/NATO strap. Check it out on