====== Landeron 48 ======
**Cal. 48** is one of a family of [[chronograph]] movements produced by [[Landeron]] from [[1937]] through the [[1970]]. In all, over 3.5 million examples were produced.

===== Overview =====
It is a 13.75 [[ligne]] movement with a [[cam switching]] chronograph system. a variety of 14 ligne variants were produced, as well as complicated versions with calendars, moon phase, and hour counters.

The preceding [[Landeron 47]] movement (the first cam-actuated chronograph) featured three buttons Start, stop, and reset. Cal. 48 switched to two-button operation. But unlike most modern chronographs, where start/stop share a single button, Cal. 48 has one button (at 2 00) to start and a second (at 4 00) to stop and reset. A later revision of this movement, resulting in Cal. 149/189/349, features conventional start/stop button operation.

The original Landeron 48 featured a deep, curving [[hammer]], a feature carried on to the 54, 56, and 58. The Landeron 51/151 features a conventional "boot" hammer, as does the 55, 57, 59/159, 80/180, and 81/181. The Landeron 148 moved to a distinct "JI" hammer shape, a feature shared by the 149/189/349, 154, 185, 186, and 187/248. Finally, the Landeron 152/352 moved to a deeply bowed hammer, a feature shared by the 153/353.

===== Family =====
  * Curved hammer
    * Landeron 48 - 13.75 ligne
      * Landeron 58 - Calendar
    * Landeron 54 - 14 ligne
      * Landeron 56 - Calendar
  * "Boot" hammer
    * Landeron 51/151 - 13.75 ligne
      * Landeron 59 - Calendar
        * Landeron 159 - Calendar, date hand at 6 00
      * Landeron 80/180 - Different pusher layout, calendar
      * Landeron 81/181 - Calendar, moon phase
    * Landeron 55 - 14 ligne
      * Landeron 57 - Calendar
  * "JI" hammer
    * Landeron 148 - 13.75 ligne
      * Landeron 185 - Calendar
      * Landeron 186 - Calendar, moon phase
    * Landeron 154 - 14 ligne
  * "JI" hammer (revised) - Landeron stop/reset button
    * Landeron 248 - 13.75 ligne
      * Landeron 187 - Date
  * "JI" hammer (revised) - Conventional chronograph operation (start/stop button)
    * Landeron 149 - 13.75 ligne
      * Landeron 189 - Calendar
      * Landeron 349 - Hour counter
  * Bowed hammer
    * Landeron 152/153
      * Landeron 352/353 - Hour counter


{{tag>Movements Landeron_calibres Chronograph_movements Manual_winding_movements}}