Ebosa 131
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| Ebosa 131 |
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Description
The large, 13 ligne diameter, Ebosa caliber 131 is a rather simple and crude pin lever
movement.
In the whole movement, only one jewel is used. It is on the place, which can be seen best: The
cap jewel of the balance. At least, the balance uses a regulation mechanism with a long
regulator arm. On its other end, a "U" shaped wire is used as hairspring regulator. Not
exactly, what you see as precision...
From a technically point of view, this movement is a little bit interesing, as it uses a very
low beating frequency, from 17280 A/h, which is pretty unusal. The balance uses a finger to drive
the escapement. The indirectly driven center second wheel uses a weird mechanism: The outer
gear ring of the second wheel drives the ring(!) of the center second wheel...
On the dial side, a simple yoke winding mechanism is used; the hands are driven indirectly by
the mainspring and just like on Roskopf movements, minute and hour axle can be easily removed.
The movement seen here does not run any longer, probably due to the fact, that its simple
construction teared away too much material inside.
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| dial side view |
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Technical data
| Manufacturer | Ebosa |
| Caliber | 131 |
| Number of jewels | 1 |
| Escapement | pin lever |
| Balance | Nickel |
| Shock protection(s) | none |
| Balance cock direction | counterclockwise |
| Hairspring stud | fixed |
| Regulator type | Long regulator arm |
| Movement construction | Fork
Escapement wheel, Fourth wheel, Third wheel, Mainspring barrel
Center second pinion |
| Features | SCI |
| Functions | Hour, minute, second |
| Beats per hour | 17280 |
| Size | 13''' |
| Image in Flume Werksucher | 1952 25 |
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| Factsheet |
Usage gallery
