this regulation alters the length of balance spring from the balance spring stud-longer slows -shorter speeds up and measured by rate in seconds per day the adjusting of beat is making the watch ticking and tocking equally and measured in milliseconds of error- adjusting is getting balances impulse
series 3's have calibre 2220 or a re-stamped 0552/924-3306 with a calibre 15cht from the royal navy fleet air arm series 3 which also has the calibre 1872 option yours have series one(1940-50) hands the dial is ......
ANNUAL CALENDAR The Annual Calendar indicates the day of the week, the month, and the date, automatically taking into account months with 30 and 31 days. If the watch is worn daily, the date only needs to be corrected on March 1 (forward by 3 days in non-leap years, and by 2 days in leap years). A c
this model was made in only 3 examples-white gold-rose gold -yellow gold. so i assume the lapis was the same and made in 3 examples these models were one of the first models made by the chaumet brothers and the watchmaker-daniel roth on the breguet resuscitation.