MB&F’s HM8 Only Watch – created for the Only Watch Auction on November 11 - features a doodle by a 15-year-old aspiring ballerina. It is rather fitting for a charity auction that will raise funds to fight Duchenne muscular dystrophy, a condition that mostly afflicts children.

Cassandra (right) created the doodle that appears on this HM8

Held under the patronage of Prince Albert II of Monaco, the Only Watch Charity is organized by the Monegasque Association and is the world’s foremost charity auction entirely devoted to research on Duchenne muscular dystrophy. Since 2005, more than €25 million have been raised to finance fundamental and applied research in this field.

This Only Watch model is based on MB&F’s 2016 release, the Horological Machine N°8, an avant-garde timepiece that references the cars that participated in the legendary Can-Am race. It’s most striking visual characteristic is the two polished roll bars - milled from solid blocks of grade 5 titanium and polished to a mirror shine - that run along the length of the dial. The HM8 Only Watch is made from 18K white gold and grade 5 Titanium.

The miniature white gold elephant was sculpted by Kuhn

Cassandra’s doodle is engraved and metalized on the sapphire crystal pane that surmounts the HM8 engine between the two roll bars. It is learnt that the Madrid-based Cassandra’s parents are friends of MB&F founder Max Büsser and the inspiration for this timepiece came from a doodle that the teen had gifted to Büsser last year. Cassie had reportedly worked two recognizable figures from the MB&F catalogue - Melchoir and Sherman – in the doodle that she gifted Büsser.

As an exception for MB&F’s contribution to Only Watch, Legendre and her family agreed to this one-off participation to strengthen the message of HM8 Only Watch — a child creating something to help children who have been denied many of the dreams and opportunities of childhood.

The characteristic roll bars of the HM8

The watch has a lateral time display and for the Only Watch edition, MB&F has roped in engraver Oliver Kuhn who previously sculpted the aliens on the HM6 Alien Nation. For the HM8 Only Watch, Kuhn has crafted a miniature white gold elephant that is placed between the hour and minute prism. Kuhn’s sculpture of the elephant was based on the elephant in Cassandra’s drawing.

And in a fitting final flourish, the MB&F logo on the double-screwed plate has been replaced by a happy face – symbolizing the childlike perspective that Legendre brings to HM8. Visible under the doodle, the HM8’s engine is a three-dimensional movement conceived and developed by MB&F from a Girard-Perregaux base caliber. It uses a striking unique purple winding rotor to wind the watch. The movement features 274 components, including 30 jewels, and stores a fully wound power reserve of 42 hours.

The HM8 Only Watch has a pre-sale estimate of $83,000-103,000.