Hoptroff No.3 - 18kt Yellow Gold
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Hoptroff No.3 - 18kt Yellow Gold Hoptroff No.3 - 18kt Yellow Gold Hoptroff No.3 - 18kt Yellow Gold Hoptroff No.3 - 18kt Yellow Gold

Hoptroff No.3 - 18kt Yellow Gold

Single Dial Atomic Wristwatch

The Hoptroff No.3 is a progression from the Hoptroff No.16, the first atomic timepiece wristwatch ever built. Featuring an Art Deco styling and rugged rectangular case of 18kt yellow gold, with a rhodium bronze back, the Hoptroff No.3 displays hours minutes and atomic seconds, and adds atomic state and date dials. 

The atomic resonator is set to atomic time, but periodically the atomic physics unit will check to ensure that atomic time is properly locked: when this happens an oven will fix the ideal temperature, the internal laser will strike, the microwave resonator will reach oscillation and atomic time will be locked in.

The Hoptroff No.3 displays the state of the atomic physics unit as a traditional horological complication within a separate sub-dial; as each stage of the process occurs the sub-dial indicator will display it. Additionally the wearer may initiate this process manually if they wish by pressing a button on the back of the case; but this is not required to maintain atomic time.

It is the most accurate wristwatch in the world. In full atomic mode, it keeps time to 1 second per thousand years. In atomic resonator mode, it is still accurate to one second per hundred years.    Requires an iPhone or Android phone.

Please note - these are made-to-order items with a lead time of 3 months.  25% deposit required.


Display - Hours, minutes, seconds, atomic state, date
Atomic state indications - Power remaining, Oven on, Oven equilibrium, Laser striking, Laser stable, Microwave resonator on, Microwave resonator locked, Atomic timing locked

Top pusher: Bluetooth activation
Bottom pusher: Manual activation of atomic physics unit
Upper pyramids: Atomic mode indication

Time setting from NTP: ~30ms accuracy
Battery life: Est. 3 months in low power mode between USB recharges
Accuracy: 1.5 seconds per thousand years
Atomic resonator mode accuracy: Est. 10 seconds per thousand years
Waterproofing: Splashproof
Dimensions: 52mm x 42mm x 19.5mm

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