Ronda 9138
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| Ronda (Harley) 9138 |
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Description
A rather rarely used ladies' caliber is the Ronda 9138, which was later available under
the brand name "Harley".
The 9138 is on top of the Ronda movements in terms of features and quality. It has got a true
swiss palett anchor escapement, an Incabloc-secured balance, beating with 21600 A/h and 25
jewels altogether. The rotor winds unidirectionally; on manual winding, the mechanism is
not released, so that the last wheel spins very fast. Only the rotor is detached from the
gear now.
The date mechanism advances slowly within the last 90 minutes of a day, but can be quickset
on the second position of the crown.
This movement is not yet listed on the Flume K3 from 1972, but appears on the
Liste of all Ronda movements from 1976, so that
it's release year can be estimated quite well. It might have been producted till the eigthies based
on the fact, that the "Harley" name appeared just then and might be mostly well known because of
the micro rotor caliber 2538.
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| dial side view |
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Technical data
| Manufacturer | Ronda |
| Caliber | 9138 |
| Number of jewels | 25 |
| Escapement | Anchor with pallets |
| Balance | Nickel |
| Shock protection(s) | Incabloc |
| Balance cock direction | counterclockwise |
| Hairspring stud | moveable |
| Regulator type | Hairspring key |
| Features | SCD,QG,RDR,AUT |
| Functions | Hour, minute, second, day, selfwinding |
| Beats per hour | 21600 |
| Size | 83/4''' |
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| Factsheet |
Usage gallery
