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View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

Bulova 12ECAD (Buren 1281)

Features
automatic
date: set by changing 23-24h
since ca. 1966/67 changing 22-24h

Data
12.5''', Dm= 28.15mm, Do= 28.5mm
H= 3.25mm
F= 1.5mm
T= 1.8mm
17/30 jewels
f = 19800 A/h
power reserve 54h

Balance staff U3320

Stem W3060

Mainspring / battery
1.0 x 9.5 x 0.10mm

Hands
1.40 x 0.80mm

Comments about the data

Remarks
1965-
micro rotor, double jewel bearing if 30 jewels
double excenter regulator for curb pins and stud carrier
selfwinding gear with direction switching by a pinion floating between two huge jewels (Fig.3)
indirectly driven minute and second allow a low profile
(details cf. Buren 1320)
since 1966/67 minor modifications of base plate and simplified date driver (cf. Bulova 12EBACD)

family:
12EBA: only hour, minute
12EBAC: second
12EBAD: date for domed dial
12EBACD: second, date for domed dial
12ECAD: date for flat dial
12ECACD: second, date for flat dial

Example, year: signature; shock device
1965: M5, Bulova Watch Co, Swiss, 30 Jewels; Incabloc
(Bulova 12EBAD)

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.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft


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