Heuer Calculator Chronograph 150.633 Piaget Maximum resistance: The paramagnetic blue

Maximum resistance: The paramagnetic blue Parachrom hairspring reliably protects the movement from magnetic fields and shocks

which reveals an impressive depth effect depending on the light

The date display at 3 o’clock with the characteristic Cyclops lens ensures excellent readability and emphasizes the unmistakable Rolex look

Equipped with the anti-magnetic Parachrom hairspring

which prevent tarnishing over the years

Heuer Calculator Chronograph 150.633 Piaget Maximum resistance: The paramagnetic blueHeuer Calculator Chronograph Ref. 150. 633 Icon of the 1970s The Heuer Calculator Chronograph Ref. 150. 633 is one of the most extraordinary Chronographs of the 1970s and embodies the innovative spirit of that era. With its distinctive tonneau shaped stainless steel case, characteristic slide rule bezel, and Automatic Chronograph movement, it is now a sought after collectors item for enthusiasts of historic motorsport and pilot watches. The generously