Ronda Caliber 515 24h

Ronda Caliber 515.24H

Ronda Caliber 515 24h

BrandRonda
Caliber Number515.24H, 515H
Base Caliber515
LinePowertech 500
TypeQuartz
Lignes11 1/2”’
Diameter
26mm
Case Diameter25.60mm
Height
3mm thick
Jewels
1
Battery Cell
371
Hands1.20mm / .70mm / .20mm / 1.60mm
Battery Life~45 months
Accuracy
-10/+20 seconds per month
Hacking?Yes
FunctionsHours, minutes, central seconds, date at 3:00, central GMT hand (second time zone)
Country
Swiss Made or Swiss Parts
Known Models
Lum-Tec Combat B33, Shinola Rambler GMT, Rotary Henley GMT (add more in the comments below)

This is the Ronda caliber 515.24H (24H for 24 hours) which is basically a caliber 515 with an added GMT complication. It is a Swiss made or Swiss parts quartz movement. This caliber is also sometimes written as 515H.

In Ronda’s own words:

“Affordable metal movements for reliable quality watches.” -Ronda

This caliber features:

  • Repairable metal watch movement
  • 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

*Pulled out stem refers to pulling the stem in time setting mode, not removing the stem completely from the watch.

Ronda caliber 515.24H quartz movement

Swiss Made VS Swiss Parts:

There are several caliber 515 based quartz movements by Ronda. There are Swiss Made and Swiss Parts versions available. Both are nickel plated metal, both have 1 jewel. Ronda documentation claims an accuracy of -10/+20 seconds per month, regardless of the movement being Swiss Made or Swiss Parts.

Where is the caliber number?

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. It is not the full caliber number (515.24H) but the base caliber.

Ronda Caliber 51524h

Ronda Stem Positions:

The better understand time-setting and disassembly instructions, it is important to understand how the manufacturer describes certain states or modes of the watch. According to Ronda, the crown/stem positions are as follows:

  • Position 1 (I) – Position of rest. Crown against the case with the watch running.
  • Position 2 (II) – Crown in date setting mode. In the case of the caliber 515.24H this is also the position for setting the GMT hand.
  • Position 3 (III) – Time setting mode. This position will also hack (stop) the seconds hand which also serves as a power saving mechanism.

Ronda Caliber 515 24h Crown Positions

Stem Removal:

To remove the crown/stem, find the hole with the arrow. While the crown is in position date setting mode (position 2), pressing this with your tweezers or other tool will allow the stem be unlocked so you can pull it out.

Ronda Caliber 515 24h Stem Removal

Changing the battery:

The correct battery cell for the 515.24H is number 371. Ronda claims that the battery should last up to 45 months. To remove the battery, there is a metal locking mechanism that 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 and do not touch the coil.

The thin orange/brown colored disc or tab below the battery is an insulator. It is necessary to prevent shorting out the battery. If your watch doesn’t work after installing a new battery, it’s possible that the insulator fell out, or the new battery cell could be bad.

As mentioned above the caliber 515.24H has a built-in power saving mechanism. If you are not going to wear your timepiece for an extended period of time, you can pull the crown out to time-setting position to reduce drain on the battery. Keep in mind that this also puts your stem and crown in a vulnerable position, so be careful about how you store your watch with the crown pulled out.

Ronda Caliber 515 24h Battery

Replacement Price:

At the time of this post, replacement prices for the 515.24H were found online in the range of $11.95 – $19.95 USD. It is unclear whether these are Swiss Made or Swiss Parts.

Caliber Commentary:

Scoochy on WUS says:

It’s not too bad, midrange quality quartz. It’s far superior to what ETA has in the same functionality department, the 805.161.

Examples of watches with the 515.24H:

The caliber 515.24H shown below was found in this Rotary Henley GMT watch here.

Ronda Caliber 515 24 In A Watch

Additional Resources:

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Shinola Caliber Argonite 515.24H Watch Movement | CaliberCorner.com
2 years ago

[…] Ronda 515.24H […]

Bruce Rezvani
Bruce Rezvani
1 year ago

Hi,
I will be grateful if you could help me with this issue;

I have a Sturmanskie Heritage Arctic GMT 51524-3331816
Product No.: S 51524-3331816

Which is supposed to have a Ronda 515-24 movement. The Date is however is at 4 not at 3. Where can I get this movement movement? is it just the regular 515-24H that I should be looking for??

Many Thanks
Bruce

Danny C.
Danny C.
1 year ago
Reply to  Bruce Rezvani

It looks like they just cut a square in the dial at 4 instead of 3. It’s the same calendar wheel since the date is at a slight angle at 4 and not straight. They probably did it to keep the date out of the way of the compass star design on the dial. You can ask others here, but I say just look for 515.24H cause there’s no such thing as a 515.24H with… Read more »

Bruce Rezvani
Bruce Rezvani
1 year ago
Reply to  Danny C.

Many Many Thanks Danny

Danny C.
Danny C.
1 year ago
Reply to  Bruce Rezvani

You’re welcome, come back to let me know how it goes with the replacement movement.

Alex
Alex
1 year ago

Found in Swiss Military CX GMT. I think that Swiss Military CX is an Invicta property.

Matthew Karwoski
Matthew Karwoski
9 months ago

Terrible durability, sloppy GMT hand movement. Not recommended

LWow
LWow
7 months ago

What was the durability issue you had with this movement and why is the GMT hand sloppy? Can you explain more?

trackback
LÜM-TEC's New Watches - The Truth About WatchesThe Truth About Watches
9 months ago

[…] new 43mm B-Series are powered by a Swiss Ronda 515.24H movement. The $399.50 titanium carbide coated Combat B46’s bound to appeal to the military-minded […]

Kenny
Kenny
7 months ago

Hello, this may seem like a stupid question, but I am somewhat of a novice. Does this movement move at 24 hours rather than the traditional 12 hours?

LWow
LWow
7 months ago
Reply to  Kenny

This movement moves at the traditional 12 hours for the main time and has an additional GMT hand for the second time. The GMT hand moves at 24 hours.

LWow
LWow
7 months ago

Excellent cheap Swiss GMT quartz movement. Can’t beat the value for a cheap GMT.

Nigel Pearce
Nigel Pearce
5 months ago

I have a tauchmeister to 311 1937 1000
Meter dive watch helium valve with ronda
515 24 gmt brilliant 70% save as well only
Let registered craftsmen change they say
Tweezers to change wrong that is mistake

Jorge Robles
Jorge Robles
5 months ago

I have an Invicta Hydromax Reserve watch with this movement for 4 years now and had found no issue at all, and still has original battery it came with. GMT function is working as intended- one rotation per 24 hours, and I have it set for Houston (CST) and Ukraine (CST + 8). Accuracy is very good for this watch’s price- 65.00 USD at a pawn shop.

Joe Shields
Joe Shields
5 months ago

Sweet little movement. Using it to drive my homemade Nav watch installed in an old Silverode Pocket watch case ($30 on eBay). Still trying to figure out how to tie the stem to the Pocket Case Crown. Do they make a universal joint stem adapter? Accurate enough that it can be set and then just bury the stem inside and it keeps good time for at least a week (so far). Gorilla glued the movement… Read more »

Joe Shields
Joe Shields
5 months ago
Reply to  Caliber Corner

No, using the 515.24H with the 24 hour hand with no 12 hour hand installed. Trying to mimic the Hamilton GCT Navigational Watch shown below. Sure I could use my Casio 3054 Radio-controlled Atomic Timekeeping LCD watch, set for Greenwich TZ, for shooting celestial objects with my sextant, but with my old eyes I have a hard time focusing on the LCD screen. I lose a couple seconds tilting it this way and that before… Read more »

Joe Shields
Joe Shields
5 months ago
Reply to  Caliber Corner

Yes, that would be a nice addition, especially when set to Greenwich time and it’s already the next day there. I’ve made that mistake before. I know… We have GPS now, but celestial navigation is such a cool thing and the history of accurate timekeeping for determining longitude such a great story.

Joe Shields
Joe Shields
5 months ago

What is meant by crown being in 0 position. If pushed all the way in is meant. I disagree. Stem pulled out one click positions the detent to center of hole and is the easiest to press and remove stem. I don’t believe you can remove the stem on a Ronda 515-24H with the stem pushed all the way in. Question — what is the value of 70% power savings running with stem removed? Why… Read more »

Joe Shields
Joe Shields
5 months ago
Reply to  Caliber Corner

oops, should have looked at your updated documentation before answering. That looks PERFECT. Please remove my reply above. Thanks! Great resource!

Joel
Joel
4 months ago

I touched the coil with my tweezers while removing the battery. This seems like “crossing the streams” from Ghostbusters…very bad. The watch isn’t working now, even after swapping out the replacement battery for another new one. Have I killed it?

Fortunately a new movement is
Fortunately a new movement is
2 months ago
Reply to  Joel

Not sure if you got an answer, but my watch guy, the only one I will let change the batteries in my watches, specifically told me about this movement, and that problem. Shorting the watch movement while changing the batteries is a movement killer. Fortunately a new movement is not that expensive.

Robert
Robert
4 months ago

Is there a source for a true 24 hour dial, or a way to print a dial similar to the Hamilton 24 hour pocket watch also on this thread? I would like to put together a watch based on this movement with a dial similar… Thanks for any advice

trackback
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[…] The Pilot Zulu features a Swiss Ronda 515.24H movement, which is broadly considered to be  an affordable and reliable caliber within the watch community.  […]

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