FREE Shipping and Returns Worldwide

C8 Power Reserve Chronometer


The Calibre SH21-powered heavyweight of our aviation range has received a brushed steel update. Boasting small second and power reserve complications and a design inspired by the Smiths Mk II clock, the C8 Power Reserve Chronometer is a technical and visual masterpiece.


Tiber Leather - Dress Clasp - 22mm Brown
Gifting Options
  • Description

    When our Calibre SH21 movement was launched in 2014, its designer, Johannes Jahnke, promised that it would provide a canvas for him to experiment with further innovations and complications. The new C8 Power Reserve shows this has now become a reality.

    With a new brushed steel case finish to accompany its matte black dial and Arabic numerals, the C8 Power Reserve carries with it many of the design cues of famous aviation timepieces like the Spitfire's Mark II A Smiths clock.

    The dial is equally impressive. At the 9 o'clock spot is the power reserve subdial, while an altimeter-inspired date calendar is at 3'o clock. The date wheel's numerals have been laser cut into the metal, with present day revealed from behind.

    Movement-wise, the watch is powered by a hand-wound version of SH21, complete with power reserve complication - making good on Jahnke's promise. Furthermore, its twin barrels - both of which are engraved with impressions of wind turbine blades - can be seen through the exhibition caseback, while the skeletonised bridge design frames the ensemble boldly.
  • Movement

    Mechanically, the hand-wound version of Calibre SH21 is every bit as impressive as its automatic sibling. Aesthetically, however, its design has been embellished with a level of detail that demands attention.

    Calibre SH21's new bridge has been modelled using design principles similar to those in the fuselage of aircraft, where strong and lightweight materials are key. Its twin barrels - decorated here for the first time - will deliver five days of timekeeping on one full wind. It's also chronometer-certified - putting it in the top six per cent of Swiss-made watches for accuracy.

    This is before any mention of JJ's all new power reserve complication - as promised in the name of the watch - which adds invaluable monitoring to the wearer. To facilitate this, the additional engineering required is meticulous: on top of the 112 components that assemble a hand-wound SH21 movement, another 28 are needed to complete the latest remarkable member to the SH21 family.
  • Diameter: 44mm
  • Height: 11 mm
  • Weight: 81g
  • Calibre: SH21 hand-wound chronometer (COSC)
  • Case: 316L steel
  • Water Resistance: 5 ATM
  • Vibrations: 28,800 per hour
  • Timing tolerance: -4/+6 seconds per day
  • Lug to lug: 53.2mm
  • Strap: 22mm
  • Swiss made
  • In-house Calibre SH21 hand-wound movement with small second and power reserve complications
  • 120 hour power reserve
  • Decorated twin barrels of SH21 visible through exhibition caseback
  • Bridge engraved and finished in black PVD
  • Marine-grade brushed steel case
  • Altimeter-inspired date wheel
  • Power reserve indicator
  • Seconds sub dial
  • Push down crown with stamped design
  • Anti-reflective sapphire crystal
  • Gun-metal hands
  • TC-1 Super-Luminova coating on hands and indices
  • Whip stitch vintage leather strap
  • Beautiful presentation case and owner's handbook