Ronda Caliber 5021.D

Brand	Ronda
Caliber Number	Ronda 5021.D
Type	Quartz, bi-compax chronograph
Lignes	12.5”’
Diameter	28.6mm
Height	4.4mm thick
Battery Cell Number	395
Battery Life	54 months
Frequency	32,768 Hz
Accuracy	-10/+20 seconds per month
Jewels	10 (gold plated / 5 jewels (nickel plated)
Hacking?	Yes
Functions	Central hours; central minutes; central chronograph stopwatch seconds; small running seconds subdial at 3:00; 3o minutes chronograph counter at 9:00; date at 6:00
Country	Switzerland (Swiss made) or Unknown (Swiss parts)
Known Models	(Add your watch to the comments below…)

The Ronda caliber 5021.D is a bi-compax style (two horizontal subdials) quartz chronograph watch movement.

In Ronda’s own words (source):

• Very long battery life
• Repairable metal watch movement
• Power saving mechanism with pulled out stem: Reduction of consumption approximately 70%
• Very easy handling by two pushers

Two Versions of 5021.D:

According to the Ronda website, there are two versions of this movement: a Swiss parts version with 5 jewels and nickel plated finish (silver), and a Swiss made 10 jewels version with gold plated finish.

Resetting the chronograph to 12:00:

If the chrono hand on your Ronda powered watch isn’t lining up, try the instructions in the video below.

Replacement Prices:

At the time of this post, replacement prices for the 5021.D were found online in the range of $35.95 to $64.95 USD. There is a difference in price based on whether you choose the Swiss made or Swiss parts version.

Pros and Cons:

Pros

• Affordable option for the trendy bi-compax chronograph layout.
• Decent battery life
• Easy to reset the hands to zero.
• Drawings and tech sheets are readily available.
• Parts are easy to identify and fairly easy to source.

Cons

• The battery clamp and screw are prone to flying away and getting lost during a battery change.
• The battery cell needs an orange insulator tab beneath it.
• Swiss made/Swiss parts offerings allow some watch brands to be ambiguous or misleading about the origin.

Additional Resources:

• Datasheet/tech drawings from Ronda (pdf)