Derby 34
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| Derby 34 |
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Description
The caliber 34 of the swiss ebauche manufacturer Derby originates most probably from
the fourties. Technically, it tries to span the bridge between minimum size and
low price.
It is equipped with a cylinder escapement, which was already a bit out-of-date then. On this
type, the tips of the escapement wheel permanently touch the balance cylinder and brakes it
more or less. This leads to comparatively low timing precision and if the movement is not
properly serviced, it can easily be brought to a standstill.
The tiny balance is not shock protected; the hairspring is regulated by a long regulator
arm and is fixed to the balance cock
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| main plate |
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On this movement, all gears are beared in synthetic rubies, except the minute wheel.
The movement brigdes seem to be divided into two parts, but that's just an illusion, in fact,
it is just one piece.
On the dial side, you will find a rocking bar winding mechanism as well as a very
simple click spring mechanism - just the way, you would expect it on such a rather
cheap movement.
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| dial side view |
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Technical data
| Manufacturer | Derby |
| Caliber | 34 |
| Number of jewels | 10 |
| Escapement | cylinder |
| Balance | Brass |
| Shock protection(s) | none |
| Balance cock direction | clockwise |
| Hairspring stud | fixed |
| Regulator type | Long regulator arm |
| Movement construction | Escapement wheel
Fourth wheel, Third wheel, Center wheel, Mainspring barrel |
| Functions | Hour, minute |
| Beats per hour | 18000 |
| Size | 53/4 x 81/2''' |
| Image in Flume Werksucher | 1947 146 |
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| Factsheet |
Usage gallery
