Cal. 148 is one of a family of cam switching chronograph movements produced by Landeron. It is closely related to the preceding Cal. 48 but uses a different stamped hammer. Like all movements in the family it uses Heuer-style oscillating pinion rather than a traditional horizontal clutch to activate the chronograph function.
Landeron Calibre 48 Chronograph Operation
Unlike many 2-button chronograph movements, the stop function shares the reset button rather than the start button. Therefore, on many Cal. 48 family movements from Landeron, the buttons function as follows:
- 2:00 – Start
- 4:00 – Stop/Reset
The later Cal. 149, Cal. 189, Cal. 349, and later movements have a conventional start/stop button at 2:00.
