|Diameter:||31 mm (13.75 ligne)|
|Complications:||2-Button, Cam Switching Chronograph, Chronograph, Date|
|Hands:||30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Date Window at 6:00, Small Seconds Hand at 9:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
Cal. 189 is one of a family of cam switching chronograph movements produced by Landeron. It is closely related to the preceding Cal. 48 and contemporary Cal. 148 but uses a conventional start/stop button rather than combining stop and reset and adds a date complication. The similar Cal. 149 lacks the date function.
The date is set by moving the hour hands past 12:00.
The Landeron Cal. 189 was famously used in the Heuer Carrera Date,Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.