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electronically controlled balance motor
day: quickset by repeated pushing the crown with 12h at bottom, 2 languages
date: quickset by repeated pushing the crown with 12h at top
zero reset of second and minute with pusher at 8h
12.5''', Dm= 28.4mm, Do= 28.8mm
(battery clamp +0.8mm, dial spacer +0.2mm)
f = 36000 A/h
Balance staff Citizen 039-87A
Stem Citizen 065-164
Mainspring / battery
313 (original, mercury), 357 (replacement, silver odixe)
1.50 x 1.00 x 0.25mm
Comments about the data
differences not known between 7801A, 7803A
With the pusher at 8h the second hand is set to zero. If the minute hand is within 57...3min, it is also zeroed.
Unique calendar quickset:
A link transfers the motion of the stem, depending on the position of the watch, to the date disk or the day disk.
So if the watch is held with the 12 to the top, pushing the crown advances the date (Fig.3), with the 12 to the bottom the day (Fig.4).
With pulled crown a post keeps the link between both positions, to prevent damage when setting the hands back over midnight (Fig.5).
The light link follows only gravity and oil could stick it to the plate. Therfore "don't oil" is written on it.
Magnetism can also affect the mobility if the link. But the involved parts should be demagnetized separately, because demagnetizing can damage the magnets on the balance.
7801A, 7803A: gold plated, reset feature
7802A, 7804A: nickel plated
7806A: nickel plated, differing stem
Example, year: signature; shock device
1973: Citizen, 7801A, Japan, 8 J.; Parashock
Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.
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