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Only Watch 2015 Only Watch 2015 is the charity auction of one-of-a-kind watches held in Geneva in aid of Duchenne muscular dystrophy.

Leroy Only Watch 2015

Leroy is donating an aluminium timepiece inspired by one of its historical models.

The “Chronomètre Observatoire – Pièce unique Only Watch” is a one-off edition of the “Chronomètre Observatoire” from the Osmior line that is inspired by one of the historical models in the brand museum: an aluminium travel clock with grande sonnerie dating from 1894.

The watch was developed and designed so as to use aluminium 316AL as the material for the case, dial (silver toned aluminium 316AL), bridges and plate, in tribute to the brand’s historical heritage, while incorporating contemporary elements, such as the Superluminova indexes, the applied Arabic numerals and the alligator and alcantara lining grey colored strap.


The 40 mm timepiece is equipped with the new hand-wound Calibre L200, offering 98 hours of power reserve. Entirely developed and built in the Leroy Manufacture, it incorporates the fundamental principles of horological science inspired by the work of Pierre Le Roy (1717–1785), “the father of modern chronometry”, and son of Julien Le Roy.



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The designers, engineers and watchmakers at Leroy are all driven by the same passion and desire, which can be summed up as follows: creating exceptional mechanical timepieces, boasting certified chronometric capabilities and tried and tested reliability.

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