Pioneer • Mk IModel 714.210-6428 By Hanhart
The Pioneer Mk I is the replica of the Calibre 40, the first precision chronograph produced by Hanhart in 1938. All of the chronograph functions on this unconventional model start, stop and zero setting are performed by a single button and always strictly follow each other. Unlike its two-button equivalent, the seconds hand on this chronograph cannot be restarted from the point at which it is stopped; the next press of the button invariably returns the spring to the original starting point. This meant that the automatic calibre used for the Mk I also had to be redesigned slightly.
HAN3601 modified automatic chronograph movement (bicompax), based on the Valjoux 7753 calibre, with increased crown-to-button spacing and single-button conversion;
28,800 vibrations per hour, 4 Hz;
Power reserve of min. 42 hours
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