Dispensing with the friction spring to drive the seconds by inserting an additional wheel and pinion, the Grönefeld Parallax Tourbillon features a direct linkage via the seconds, midway along the drive train between mainspring and the tourbillon cage. This reduction in friction contributes to a power reserve of 72 hours from the relatively leisurely 21,600v/h that the manual winding Calibre G-03 operates, and above on the dial, the power reserve is displayed in a bevelled panel with polished steel arcing reference plate.
The Grönefeld Parallax crown does not need to be pulled out on its stem to adjust the time, instead using a clever push system whereby pressure applied to the crown alternates its function between winding and setting, and up top another pointer jumps between W and S so the crown can be set to rest at winding.
Sapphire crystal exhibition casebacks are pretty much the norm nowadays, and in truth some might have been better minded to leave the movement well out of sight, but on a Grönefeld what lies beneath is definitely deserving of daylight. Using stainless steel bridges, which are arranged in lateral segments, the surfaces are a contrast of dark micro blasted finish bellies and polished edges. Needless to say, the screw heads also have been polished by hand, because if it’s on show on a Grönefeld (or even if it’s not) then it has been loved to the last.
At 43mm the Parallax Tourbillon is a universally wearable piece, although with a mere twelve examples being produced in stainless steel, and a further 24 in rose gold, it will not be universally available, because as Bart and Tim Grönefeld’s star continues to ascend, collectors in the know already have their names in the Grönefeld brother’s order book.
Grönefeld Parallax Tourbillon – Price
Red gold : 137,000 Euros
Steel : 134,000 Euros