The rapid change in temperature that the meteor rock is subjected to as it enters the atmosphere indelibly imprints its crystal structure, even if it appears homogeneous in its natural state. The rock must be treated in a series of acid baths to gradually reveal the magnificent texture born from this natural impact. 

Every step involved in working with meteor rock is a delicate process. It is difficult to machine as it is harder than normal rock; as its mineral structure is unpredictable and varying, conventional working processes cannot be used. Therefore, it is only after scientific tests, and with the benefit of their experience, that master dial-makers have come up with the perfect cut and the two colourways which the models now boasts: Abyss Blue or black.

The case of this special edition Tonda 1950 is made from titanium, a lightweight and elegant material which is particularly difficult to machine due to its inflammability. But this challenge was one which simply had to be met, as it was important that a natural element found in the periodic table – titanium, unlike platinum or gold, is not used as an alloy – was paired with something as pure and natural as a meteorite.

Parmigiani Fleurier's ultra-thin calibre

The ultra-thin PF 701 calibre owes its slim dimensions to an eccentric platinum micro-oscillating weight, housed within the confines of the movement. Measuring just 2.6 mm thick, this feat of watchmaking prowess will doubtless be used in a myriad of future settings. In fact, the case for the Tonda 1950 was designed to be 7.8 mm thick and although this measurement makes it worthy of inclusion in the range of ultra-thin models, it is deliberately not as thin as it could have been. This will allow the Tonda 1950 family to be enhanced in the future with additional complications and modules, without having to change the thickness of its case. 

The movement of the Tonda 1950 offers the finest haute horlogerie finishes you would expect from Parmigiani Fleurier, which very few brands would apply to such a mechanism. The nickel silver main plate is sand-blasted, circular-grained and then rhodium-plated. The bridges are sandblasted, drawn out or "Côte de Genève" decorated, then bevelled by hand and, finally, rhodium-plated. Also note the attractive finish of each wheel, bevelled, sunk, circular-grained on both faces, then gilded before cutting. 

The high standard of finish on each component is a result of the philosophy shared by the various centres of competence that make up the Parmigiani Fleurier Manufacture. Every aspect of Tonda 1950's movement and exterior is created in-house with painstaking care, designed to ensure each calibre showcases the very best of the Manufacture's expertise.