Ronda Caliber 513s

Ronda Caliber 513S

Ronda Caliber 513s

Manufacturer Ronda
Caliber Number 513S
Base Caliber
Type Quartz
Diameter 11 1/2”’ (25.6mm)
Battery Number 371 (1.5 V)
Battery Life
24 months
Stem 401-1483
Hand Sizes 120/70/20
Jewels 1
Functions Hours, minutes, central seconds
Country of Manufacture Switzerland
Known Models
Bulova for Harley Davidson (add yours to the comments below!)

This is the Ronda caliber 513S quartz watch movement. it is part of the Powertech line. There are two versions of this caliber: Swiss made and Swiss parts. Both versions are nickel plated with one jewel. It is considered a repairable movement.

In Ronda’s words:

Affordable metal movements for reliable quality watches.

Ronda caliber 513 vs 513S

The caliber 513S is the newer version of the 513. It has a motor pulse fix included.

Ronda caliber 513S vs 515S

The difference between these two movements is that the Ronda caliber 515S is basically the same as the 513S but with an added date complication.


According to Ronda, the caliber 513S should keep time within -10/+20 seconds per month with an operating temperature of 0 to 50 degrees Celsius.

Power Reserve

A fresh battery (cell 371) should last for 24 months. This caliber has a power saving (hacking) function that stops the second hand when the crown is pulled out. Doing this will reduce power consumption by about 70%.

Caliber Number Location

Ronda does not stamp the metal part of this movement with the caliber number, instead, you can find a reference on the outer plastic part of the movement.

Ronda Caliber 513s Caliber Number

How to change the battery

There is a metal locking mechanism for the battery that just uses tension to hold it into place. Gently put your tweezers or other tool in the hole and slide it over – not too hard and not too far. The battery will pop out like in this video. Do not remove the screw.

Ronda Caliber 513s Battery Replacement

Stem Removal

To remove the crown/stem, find the hole with the arrow. While the crown is in position 0, pressing this with your tweezers or other tool will allow the stem be unlocked so you can pull it out.

Ronda Caliber 513s Crown Stem Removal

Exploded View

Ronda Caliber 513s Exploded Drawing

Replacement Prices

At the time of this post, replacement prices for this watch movement were found in the range of $8.95-9.95 USD.

Additional Resources

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2 years ago

I have this movement in a Mondaine large date wristwatch. It is one of the Official Swiss Railway Clock models. The date doesn’t go from 31 to 01 but will count up to 39 then 00. Finally it would reach 01. I have been told this is normal for the caliber. I have my doubts about that. Have any other people heard that?

2 years ago
Reply to  Dan

Hi Dan, the Ronda 513 is a 3 hand movement without a date. If you have a Mondaine Big Date watch, it’s likely that the movement is a Ronda 509 or 519.

2 years ago

Oh yeah, I believe you are correct. I was repeating the numbers shown on a retailer’s website. Thank you for the clarification. I did poke around and saw an article talking about the date function behavior. It sounds like a normal thing. An odd choice for the maker in my opinion but a great conversation starter when today is the 34th. Ha!

1 year ago

I have this machine as picture is the sam number 513

James Clark
James Clark
8 months ago

My Luminox Leatherback Sea Turtle 39mm has this movement.

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