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Ronda 4139


Ronda 4139Ronda 4139


This Ronda "Ronda-Matic" selfwindig movement, caliber 4139, was made in the warly 1980ies. It was part of the caliber family 413x/423x/433x/443x, which was produced in different sizes, ranging from 8 3/4 up to 12 lignes, and was available as handwind and selfwindig versions. The calibet 4139 winds in one direction and uses a swiss lever movement, although it is signed as "RL", which normally stands for Ronda pin-lever movements.

It offers all possible kinds of indications, hour, minute, second, date and weekday (in names as well as in digits from 1 to 7). The date can be quickset by a very unique mechanism: When you set the time backwards, the date advances every 30 minutes.

A big thanks to Mr. Stahl from the Ermano Uhrenwerke GmbH for identifying this movement and providing me very interesting details about it.



 Technical data

Number of jewels21
EscapementAnchor with pallets
Shock protection(s)???
Balance cock directioncounterclockwise
Hairspring studmoveable
Regulator typeHairspring key
FunctionsHour, minute, second, day, weekday, selfwinding
Beats per hour21600
Production time198x
Ronda 4139RondaRonda4139198x8 3/4''''''Ronda 413921 Jewels, 8 3/4'''''', 21600 A/h, SC?,QG,JG,RDR,AUT



Usage gallery

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