For the second time, Greubel Forsey explores the contemporary timepiece with a titanium case. Treated with vacuum deposited ADLC (amorphous diamond-like carbon), in addition to its striking appearance, this deep black coating gives the watch a surface hardness significantly greater than natural titanium.

With the movement's main plate and bridges also in black finish, the palette of colours is more restrained. This helps to bring out the contrast between the different textures and surface finishes of each component's decoration.

Greubel Forsey - GMT Black

The back of the timepiece displays universal time for 24 time zones, through an original rotating disc. © Greubel Forsey

However, relatively stronger colours are used to subtly highlight all indications of time and technical information. The various dials and indication zones appear to be floating in the space around the terrestrial globe, evoking the night sky with the stars twinkling in their eternal orbits.

Greubel Forsey - GMT Black

Robert Greubel and Stephen Forsey have incorporated into their timepiece a terrestrial globe completing each anti-clockwise rotation in 24h - the same direction in which our planet spins. © Greubel Forsey

This unique edition will be composed of just 22 timepieces worldwide.