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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Bulova 12B (Junghans 689.70 / J89)

Features
manual-wind alarm
sweep second

Data
12.5''', Dn= 28.20mm
H= 6.4mm (5.5mm without sweep second)
17 jewels
f = 18000 A/h
Gangreserve 36h/45h
(alarm on/off)
alarm 10s

Balance staff U1518

Stem W1292

Mainspring / battery
Zf1403, 1.70 x 11.5 x 0.12 x 385mm

Hands
2.20 x 1.41 x 0.79 x 0.18mm

Comments about the data

Remarks
1951-1958
especially made by Junghans for Bulova with 17 Jewels
common barrel for watch and alarm
ratchet on dial side, crown mechanism with rocker bar

Operating Instruction:
Wind watch and alarm: crown at 3h.
Set time: pull crown at 3h and set time. If you set the time reverse and pass the alarm time, this will be set reverse simultaneously.
Set alarm: crown at 2h. The alarm time can only be set reverse, setting forward is inhibited by a freewheel.
Enable alarm: push pusher at 4h.
Disable alarm: pull pusher at 4h.

Example, year: signature; shock device
ca. 1955: Junghans 89; Junghans II
(Junghans 689.70, 20 jewels)

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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