Parmigiani Fleurier expands its Tonda 1950 ultra-thin watch series by presenting a skeleton edition showcasing the minute details of the skeletonised Calibre PF707 mechanical self-winding movement powering this timepiece.
Through the open worked layout, one can admire the fascinating view of movement gears, including components which never usually see the light of day. The main plate and bridges have been skeletonised to their very limits, only retaining as much substance as the watch needs to operate. The barrel is also open, finally allowing the winding spring to be seen.
Visible from both front and backside of the watch, the finely decorated oscillating micro-weight boasts an engraved “barley grain” on the back of the rotor and a pattern composed of Parmigiani Fleurier’s iconic lugs, key to the brand’s design DNA, on its surface.
The lug pattern is laid out so as to evoke a rotating movement, accentuating the circumvolutions of this oscillating weight. The calibre PF707 has 18 internal angles on the bridges and main plate, and every detail is carefully chosen to enhance the skeleton work.
The sapphire dial ensures nothing obstructs the view of the skeletonised movement, except around the periphery, where the crystal is enclosed by a rose gold metal flange displaying the minute track and indices. The back of this flange features minutely detailed engraving, with fine, elegant concentric snailing adorning its surface.
Exterior of the watch has been carefully designed to ensure the wearer enjoys perfect comfort and ergonomics. The steel case is 40 mm in diameter, with a thickness of just 8.2 mm. It extends into four lugs which flank the strap, with their iconic teardrop shape beautifully echoing the curve of the wrist. The steel folding buckle can be adjusted to 5 positions. With one press, the wearer can adjust the effective length of the strap, millimetre by millimetre, without having to switch to another attachment hole in the leather.
The Parmigiani Fleurier watchmaking centre has devoted all of its cutting-edge expertise to perfecting the precision of the PF707 movement. This is the case for the variable-inertia balance, which now eliminates the need for the conventional index-assembly. This innovation makes it possible to adjust the moment of inertia by rotating the inertia blocks rather than adjusting the active length of the balance-spring as required with a standard adjustment. The movement is more stable over the long term, more shock-resistant, with outstanding isochronism guaranteed.
Winding: Automatic, micro-rotor
Power reserve: 48 hours
Frequency: 3 Hz – 21,600 Vib/h
Dimensions: 13 ¼’’’ – Ø 30 mm
Thickness: 2.6 mm
Decorations: Skeletonised bridges and main plate, 18 internal angles
Dimensions: Ø 40 mm
Water resistance: 30 m
Crystal: Anti-reflective sapphire
Colour: Transparent sapphire with rose gold gilded metal flange
Finish: Sand-blasted, polished and snailed
Indices: Rose gold metal
Hands: Delta-shaped with luminescent coating
Leather: Black alligator
Buckle: Folding, adjustable