Ronda Caliber 515s

Ronda Caliber 515S

Ronda Caliber 515s

Brand Ronda
Caliber Number Ronda 515S
Base Caliber
Ronda 515
Line Powertech 500
Type Quartz
Lignes 11 1/2”’
Diameter 26mm
Casing Diameter
3mm thick
Battery Cell Number 371, SR920SW (1.5 V)
Claimed Battery Life 24 months
Jewels 1
Hacking Seconds? Yes
Dial Feet
Near 8:30 and 2:30
Functions Central hours; central minutes; central seconds; date at 3:00
Swiss made or Swiss parts (assembled in unknown)
Known Models
(Add your watch to the comments below…)

The Ronda caliber 515S is a common 3 hand quartz movement. This caliber is part of Ronda’s powertech family of movements.

According to Ronda, this caliber features:

  • Repairable metal watch movement
  • Fix motor pulse
  • Power saving mechanism with pulled out stem: Reduction of consumption approximately 70%
  • Interchangeability: All versions 11½”’ with same movement height 3.00 mm and stem height 1.50 mm
  • Very powerful stepping motor

Ronda Calibre 515s

Ronda 515S VS 515:

The 515S is a newer version of the 515 that fixes a motor pulse issue. Despite the 515S being a newer version, an interesting note is that the 515S only offers 24 months of battery life, but the 515 has a 45 month standard battery life. These two movements are interchangeable.

Motor Pulse Fix?

Have seen a lot of 515 powered watches, but none labeled as 515S. Ronda doesn’t give much information about the supposed motor pulse issue, but since it’s a case of a manufacturer admitting to a known issue and responding with a fixed version, there must be something to it. If you know anything about the motor pulse issues, or if you have experienced it in a watch, please describe it in detail below.


Official Ronda documentation claims that the 515S has an accuracy rating of -10/+20 seconds per month.

Swiss Parts Vs Swiss Made:

According to the Ronda website, there are two versions of the 515S: Swiss made and Swiss parts. Both are nickel plated with 1 jewel. You may see Swiss parts variations listed as being made by Harley Ronda. Other than the ability to put a Swiss Made label on the watch, there isn’t much difference between the two.

Replacement Prices:

At the time of this post, the 515S is still not as common as the 515, so they are not as easy to find. Replacement prices for the caliber 515 were found online for $17.95 USD. Also note that many of the movement resellers will be offering Swiss parts versions, but don’t necessarily mention if the movement is Swiss made or Swiss parts in the description.


  • Ultra affordable Swiss movement.
  • Replacements are easy to find.
  • Fixes any previous issues with a motor pulse.


  • The coil is next to the battery clamp, making it easy to slip your tool during a battery change and damage the movement.
  • Half the battery life of the original 515.

Additional Resources:

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