EB 8805
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| EB 8805 |
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Description
One of the most commonly used swiss pin-lever movements with date indication was the
caliber 8805 of Ebauches Bettlach.
It only uses one single jewel, which is used together with a KIF Protechoc shock protection for
the very light balance wheel. This balance wheel is so light, that it tends to stop on many
external influences. A more thick and heavier Glucydur balance, maybe even with screws, would
not be influenced at all, but continue ticking.
The simple construction of this movement leads to some rather curiousities: On the main plate, you
see four bearings, but only three of them are used for gears, the fourth one (located at "6:30")
is just empty. Why? No idea... Furthermore, the mainspring is secured on top only by a small metal
bracket and the click spring works on the crown wheel instead of the mainspring wheel.
The pin lever movement has got a directly driven center second hand and beats with slow
18000 A/h. On the other hand, a moveable stud and an armless hairspring regulator is used, so you
see an interesting mixture of outdated, contemporary and cheap techology on this movement.
On the dial side, this movement is rather familiar constructed with a yoke winding mechanism
and a date construction, which switches instantly at 12:00 and can be advanced by turning the
hands forth- and backwards.
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| dial side view |
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Technical data
| Manufacturer | EB |
| Caliber | 8805 |
| Number of jewels | 1 |
| Escapement | pin lever |
| Balance | Nickel |
| Shock protection(s) | KIF Protechoc |
| Balance cock direction | clockwise |
| Hairspring stud | moveable |
| Regulator type | Hairspring key |
| Movement construction | Fork
Escapement wheel, Fourth wheel, Third wheel, Large driving wheel
Mainspring barrel |
| Features | SCD,QG,RDR |
| Functions | Hour, minute, second, day |
| Beats per hour | 18000 |
| Size | 12''' |
| Image in Flume Werksucher | K3 69 |
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| Factsheet |
Usage gallery
