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Ronda 1215

 

Ronda 1215Ronda 1215

Description

Probably in the early 1970ies, Ronda launched their caliber series 10xx/11xx/12xx/13xx, which bases on the caliber 1011 and consists of two dozen combination with different features, with pin- or pallet lever and different beating speed.

To that series belongs the 12 ligne caliber Ronda 1215, a pin lever movement with date indication, center second and (here) 21 jewels.

base platebase plate

The base plate of that movement shows, that it is not a pillar construction, but on the other hand, it's not fully massive, too. It does not say very much about the functions and construction of the movement, but at least, all bearings, except of those for the seconds wheel and the mainspring barrel are equipped with rubies. But that's not neccessiarly typical for this movement, which was also available with 17 and with 1 jewels.

blind jewelsblind jewels

If you hold the movement shown here into the light, you see three blind jewels, two at the mainspring barrel and one at 5:30, below the balance wheel. Three additional cap jewels are mounted within one single plate onto the movement bridge, so that finally, there are not only the usual maximum of 15 jewels for a pin lever movement, but 21 jewels:

Plate with three cap jewelsPlate with three cap jewels

The octogonal framing the jewels is typical for Ronda and probably an indication, that the holes were stamped and not drilled.

 gear traingear train

The Ronda 1215 has got a modern gear train, with mainspring barrel, second, third and escapement wheel. The time indication is driven on the dial side by the mainspring barrel. 

side view of the gear trainside view of the gear train

Unfortunately, the anular balance of the movement is not shock protected. It works with 18000 A/h and regulates a pin lever movement.

finger of the leverfinger of the lever

Interestingly, the finger sits on top of the lever.

empty dial sideempty dial side 

On the empty dial side, you see, that the hands will be driven by the mainspring barrel.

For a pin lever movement, it's a bit unusual, that it uses a well made yoke winding system. Additionally, it shows a clever construction, since its spring is part of the setting lever and not an extra part.

date mechanismdate mechanism

As usual on their later movements, Ronda has got a date indication mechanism with an unusual quickset mechanism: At 1 o'clock, there's a moveable star wheel, which only works when the time is turned back. It advances the date ring then. A moveable finger on the switching wheel at 11 o'clock ensures, that the quickset mechanism also works between 11 and 12pm and does not harm the date mechanism.

Ronda 1215: Dial sideRonda 1215: Dial side

 

 

 

 

 Technical data

ManufacturerRonda
Caliber1215
Number of jewels21
Escapementpin lever
BalanceNickel
Shock protection(s)none
Balance cock directionclockwise
Hairspring studmoveable
Regulator typeHairspring key
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Large driving wheel
Mainspring barrel
Construction typesolid construction
Winding mechanismyoke
Setting lever spring3 holes
FeaturesSCD,QG,RDR
FunctionsHour, minute, second, day
Beats per hour18000
Life angle52°
Size12''' (measured: 26,5 mm)
Image in Flume Werksucher K3 -
Inventory ID 17021
Ronda 1215RondaRonda121512'''Ronda 121521 Jewels, 12''', 18000 A/h, SCD,QG,RDR
Factsheet

 

 

 

This movement is a kind donation from Rolf-Jürgen. Thank you very much for supporting the movement archive!