Amida 425
Description
Amida is one of the manufacturies, which were rather seldom found and which had no clear vision on their movements.
The caliber Amida 425, which is part of the caliber series Amida 420, is a 11 1/2 ligne pin lever movement of fair quality. It is a relative of the pallet lever caliber series Amida 710.
base plate
Although it is only a pillar construction, it is quite well made. So, for example, all important bearings contain rubies and there’s even a shock protection used, to be seen on its golden toned frame.
gear train
The gear train of the Amida 425 is of Roskopf type, with a dial-side driven display works. Unlike native Roskopf movements, neither a slipping clutch on the mainspring barrel is used, nor is the gear train reduced by one wheel.
The gear train is the following: Mainspring barrel - second wheel - third wheel - seconds wheel - escape wheel, where the seconds wheel indirectly drives the center seconds wheel.
As escapement, a pin pallet escapement is used, which is well and flat executed.
side view of the gear train
In contrast to “real” Roskopf movement, the two leg anular balance beats with the standard rate of 18000 A/h. This rate can be adjusted on the hairspring key only.
For preventing damage by shocks, a pair of KIF Trior shock protection bearings is used for the balance wheel.
Amida 425: Dial side
An oddity is the indirectly time display works: It happens by a double change wheel, internally connected by a slipping clutch, where the lower wheel engages with the mainspring barrel and the upper wheel simultaneously drives cannon pinion and hour wheel.
Besides this oddity, it shall be noted, that the Amida 425 uses a “true” and well executed yoke winding system, just like it is used on any “better” pallet lever movement.
In the lab
Timegrapher result
Of course, it performed poor on the timegrapher, but taking into account, that this movement was beyond any hope before and literally brought back to life, the rates are acceptable. If the amplitudes are correct cannot be said, since the lift angle of this caliber is unknown.| horizontal positions | |||
|---|---|---|---|
| dial up | +74 s/d | 267° | 0,3ms |
| dial down | +-0 s/d | 300° | 0,4ms |
| vertical positions | |||
| crown right (12 up) | +44 s/d | 247° | 0,1ms |
| crown up (3 up) | +85 s/d | 238° | 0,1ms |
| crown left (6 up) | +68 s/d | 236° | 1,0ms |
| crown down (9 up) | +60 s/d | 236° | 0,9ms |
Technical data
| Manufacturer: | Amida |
| Caliber: | 425 |
| Caliber base: | Amida 420 |
| Size: | 11 1/2''' (measured: 25,7mm) |
| A/h: | 18000 |
| Escapement: | Pin lever |
| Balance types: |
monometallic anular balance (two legs) |
| Shock protection(s): |
KIF Trior |
| Balance bearing / direction hairspring: | Counterclockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Construction type: | pillar construction |
| Winding mechanism: | yoke winding system |
| Attachment of setting lever: | screwed |
| Setting lever spring: | 4 hole(s) |
| : | screwed |
| Features: |
|
| References: |
Flume: K3 - |
| Inventory number: | 23008 |
Usage gallery
Preziosa gents watch (case missing)