18038, Day-Date, Onyx Dial, Yellow Gold Haldimann and synchronized through a spherical

and synchronized through a spherical differential that averages any of the few aberrations which would arise from the four high-beating oscillators fed through dual mainspring barrels

It is a benchmark example

This is example number 1 of the series

This was the first classically proportioned model from Greubel Forsey

18038, Day-Date, Onyx Dial, Yellow Gold Haldimann and synchronized through a sphericalA ref. 18038 Day Date with a spectacular Onyx dial. Onyx dials are made of natural stone and, from this time, absent of any indices whatsoever. They also distinguish themselves from standard Day Dates with faceted, framed gold aperture surrounds. This example has no hairline fractures whatsoever and is signed Swiss alone, as it should be. Originally property of a Venezuelan collector, this example comes with a Spanish Day disc and Spanish papers.