Landeron caliber 186 is Swiss movement from 1950’s.
Functions: 2 registers on the dial – 60 seconds, 30 or 45 minutes, sub second, cam switched, day, date, month and moon phase indication.
Manual-winding movement with 17 jewels
f = 18000 A/h
Power reserve: 41 hours
Diameter: 31.0 mm
More information:
Chronograph 186 is the same as caliber 148, with the addition of a calendar and moon phase devices. 
Disassembling:
To gain access to the calendar and moon phase devices, it is necessary first of all to go through operations 1 to 6 for disassembling the chronograph mechanism, after which the moon phase device can be disassembled easily.
Assembling:
The device is equally easy to assemble, but the following special points should be taken into account: date star driving wheel 2556 should be placed with its mark H on the line joining the center of the movement and the center of the wheel. It is advisable to make moon phase star 2587 jump forward about 12 hours after the “jumping” of the calendar stars occurs, so as to reduce the resistance of the gears concerned. To do this, place moon phase star driving wheel 2597 with its mark I on the extension of the line joining the center of the movement and the center of the wheel. Then place day star driving wheel 2560 with its mark K on the line joining the center of the movement and the center of the wheel.
Cheking and Lubrication, working and setting of calendar and moon phase devices:
As for caliber 185. Any almanac will show the phase of the moon at the time of setting. Pusher D works the moon phase disk. Do not use the pusher to work the moon phase disk between 10 a. m. and 2 p. m., when the automatic “jumping” takes place.
Other links:
Landeron caliber 186 watch parts
