This trio of watches is a technical tour de force which reveals that, even if it takes them more than a decade, there is little that Greubel Forsey is not capable of.

by James Buttery

Master of the high complication, Greubel Forsey has released a trio of watches at SIHH this morning furthering its aim of advancing and refining the mechanics of watchmaking.
Stephen Forsey and Robert Greubel have even found a home for the fifth of the brand’s seven portentous Fundamental Inventions, the Differentiel d?Egalite, a constant force development that has been in development almost as long as the company has existed.
The differential itself uses 24 components including a differential cage than delivers constant torque and ?rewinds once per second with integrated spring?. We?ll try and prise a more detailed explaination out of Forsey when we sit down with him at SIHH this week – but it does claim that the watch ?maintains a constant balance amplitude during the 60 hours of the power reserve? which is a hugely impressive achievement. Power is supplied by twin, series-coupled mainspring barrels.
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