Bulova 5 BD
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| Bulova 5 BD |
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Description
The Bulova 5 BD is an extraordinarily well made ladies' watch form movement, which debuted
around 1970. It impresses not only by its glossy golden-toned finish, but also by the number of
used jewels: 23 jewels are record-breaking in this class!
The golden-toned Glucydur balance in beared in two KIF Ultraflex shock protection systems. The
hairspring is connected to a moveable stud, its effective length can be regulated by the hairspring
key only - a solution, which is a bit too simple for such a well made movement.
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| main plate |
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The (almost) empty main plate shows, that the escapement wheel is beared in a chaton with
cap jewel, and that additionally, the mainspring barrel is jewel-beared, too. The latter has
not go technical advantage, though.
How well the free space on that movement is used can be seen on the tiny lower boundary of the
mainspring barrel. For a watchmaker, this requires exteme caution when clamping the movement for
not bending or breaking it!
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| inner view of the gear cock |
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The gear cock also contains three chatons with cap jewels, which means, that the escapement wheel
is beared in 4 jewels, fourth and third wheel in three jewels.
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| dial side view |
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On the dial side you see two further chatons with cap jewels - here for the pallet lever and for
the escapement wheel. And of course, this movement uses a yoke winding system, but that's standard
for such a fine movement.
Technical data
| Manufacturer | Bulova |
| Caliber | 5 BD |
| Number of jewels | 23 |
| Escapement | Anchor with pallets |
| Balance | Glucydur |
| Shock protection(s) | KIF Ultraflex |
| Balance cock direction | counterclockwise |
| Hairspring stud | moveable |
| Regulator type | Hairspring key |
| Movement construction | Fork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel |
| Winding mechanism | yoke |
| Setting lever spring | 2 holes |
| Functions | Hour, minute |
| Beats per hour | 21600 |
| Size | 51/2''' (measured: 13,0 x 15,2 mm) |
| Image in Flume Werksucher | K3 - |
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| Factsheet |
