Unsplash stock photo (generic placeholder pending official product photography)
A collaborative, inverted-construction unique piece by Greubel Forsey, Urwerk and the Time Æon Foundation (watchmakers Dominique Buser & Cyrano Devanthey), fully hand-made with twin barrels and a differential-regulated large balance wheel; sold at charity auction, not a standard production model.
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Case diameter and lug-to-lug drawn to scale (4px per mm) against a millimeter ruler — hold a ruler or tape measure up to the screen to compare.
This watch is missing a lug-to-lug measurement, so we can only show the case diameter to scale above.
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