Editor's note: This story has been updated to reflect the fact that Antiquorum changed the date of the "Only Watch" auction to Sept. 23.

New York--On Sept. 23, the Principality of Monaco will stage the charity watch auction “Only Watch,” where 39 unique timepieces will be sold by auction house Antiquorum and all proceeds will benefit research on Duchenne muscular dystrophy.

Each Swiss watchmaker involved has created a unique timepiece for the fourth edition of the charity event, including brands such as Audemars Piguet, Chopard, Girard-Perregaux, Harry Winston, Piaget, Hublot, Patek Philippe, Ulysse Nardin, Vacheron Constantin and Van Cleef & Arpels.

From Aug. 30 to Sept. 17, the Only Watch 2011 collection will be showcased in a world tour, visiting capitals including New York, Milan, Tokyo and Beijing, ending in Monaco with a two-day exhibition before the auction.

Since the last edition of Only Watch, in Sept. 2009, 3.5 million was donated to 15 scientific partners and their teams, including researchers and clinicians in five countries, with the goal of developing treatments for Duchenne muscular dystrophy.

“Your presence is heartening because it shows that you are wisely able to turn professional competitiveness into a beneficial ambition and enthusiasm for a noble cause,” Luc Pettavino, president of the Monaco Association against Muscular Dystrophy and initiator of Only Watch, said of the auction’s participants.

Duchenne muscular dystrophy is a highly debilitating neuromuscular disease that affects 1 boy in every 3,500, which is approximately 250,000 children, teenagers and young adults worldwide.

“While you may not be personally affected by this disease, your generosity and good-heartedness will help to save lives,” Pettavino continued.

Find out more about the Only Watch auction here.