Goutte d'Eau, Hydrium, HydriumX, Old Radium Bronze, Mercury, Flyway...

Your Isotope has an automatic movement and does not require a battery. If your watch stops, you can wind it or simply use it for a few moments and the motion of your wrist will be enough to power the watch.

Your Isotope has been assembled with either a Seiko NH35 or NH8 (early Goutte d'Eau), ETA, Sellita, and Swiss Landeron. All movements are self-winding and if used on a daily basis, they will store energy for up to 41 or 38 hours respectively.

Very important: Water resistance

Your Isotope has been tested to a depth of up to 300, 200, 100 meters or less - please check the case back of your watch.

To ensure its water resistance do not screw, unscrew or rotate the crown(s) while underwater.

Inner bezel (Goutte d'Eau 1.0 and 2.0)

The crown at 2 o'clock operates the inner bezel (only when the watch is dry). This crown has 4 gaskets and does not unscrew (Goutte d'Eau 1.0).

The crown at 2 o'clock operates the inner bezel. This crown has 2 gaskets and needs to be unscrewed to operate - remember, only when the watch is dry (Goutte d'Eau 2.0).

The inner bezel is used to measure the decompression time. 

To operate the inner bezel, unscrew the crown and rotate the crown clockwise. Do not operate underwater.

Set time/date (version with date window)

The crown at 4 o'clock sets the time and date. 

This screw-down crown improves water resistance and protects the movement.

To unscrew the crown, turn it counterclockwise.

After adjusting the time or date, push in the crown and turn it clockwise applying moderate pressure.

Please make sure you always fully screw in the crown before operating the watch underwater.

Wind the movement

To wind the movement, unscrew the crown to position 1. If the movement is stopped, rotate the crown clockwise. Do not wind more than 40 rotations.

Set the date 

To set the date, gently pull the crown to position 2. Then turn the crown counter-clockwise. Important: To avoid damaging the movement, do not adjust the date between 9 p.m. and 3 a.m.

Set the time

To set the time, gently pull the crown to position 3 (or position 2 if your watch does not have a date window). The second hand can be stopped at 12 o'clock for accurate time setting. Then turn the crown clockwise to set the time.

Caring for your Bronze CuSn8 Isotope

Bronze is a copper alloy and oxidises when in contact with oxygen. The bronze forms a natural patina, which gives your watch a unique character. With time, your Isotope bronze watch will become darker due to oxidation: the patina. This is a natural process and does not indicate quality issues.

The patina acts as a natural protective layer for bronze and you should not remove it. However, if you want to remove the patina, we suggest, but do not recommend, a mix of vinegar and salt. Dissolve both components and rub the bronze components with a soft cloth or brush. When the desired effect is achieved, rinse the watch with tepid water.

Bronze is a living alloy and it's not hypoallergenic - data suggests that more than 10% of the world population is known to be allergic to nickel. Therefore, a bronze watch case may irritate your skin.

Chronograph and Jumping Hour

For the Rider Jumping Hour, Compax Moonshot, and Ovni Jumping Hour, please email us for specific instructions (


Following these simple instructions will help your watch and movement last a lifetime.

Please ensure that you service your watch every 7 to 10 years. As a mechanism with gears, regular maintenance is necessary to keep it functioning properly.

Enjoy your watch and email us if you have any questions.


Thank you,

José Miranda│Co-founder