Mechanical watches of 24 caliber
(mechanism 2427, 2428)
with double calendar
Periods of balance fluctuations 0,4 sec
Average dayly move at the temperature (20+-5) - from 20 to 40 sec/day.
Central trotting seconds hand
Mechanism 2427
Heights of mechanism - 6,85 mm; Number of ruby stones - 24;
Term of energy autonomy not less than 39 hours
Self-winding with reversional muffs Mechanism 2428
H-4,85mm, ruby st.-21, auton.-42 hours
