Miyota 6S20 Quartz Chronograph Caliber Movement
Miyota 6S20

Miyota Caliber 6S21

Miyota 6S20 Quartz Chronograph Caliber Movement

Manufacturer Miyota (Citizen)
Caliber Number 6S21
Type Quartz
Replaces Caliber Citizen 0510
Linges 15”’
Diameter
34.6mm
Height
4.9mm thick
Case Thickness
9.85mm minimum
Jewels
0
Battery Cell Number SR927W (395/399)
Battery Life
~3 years
Frequency 32,768Hz
Stem 065-A13, tap 10
Hand Sizes 1.20mm / .70mm / .26mm / .17mm
Functions Central hours, central minutes, central chronograph seconds, small seconds subdial at 3:00, 60 minutes chrono counter at 9:00, date at 4:30 (could be different depending on the watch)
Country of Manufacture Japan
Known Models Invicta Corduba (Add your watch to the comments below…)

The Miyota caliber 6S21 is a 0 jewel quartz chronograph watch movement made in Japan.

PICS COMING SOON – for now, there are images of the similar 6S20.

Miyota 6SXX Family:

The Miyota caliber 6S21 is part of the 6SXX family of quartz chronograph movements including the 6S10, 6S20, 6S30, and 6S11. The 6S21 featured on this page is the closest to the 6S11 with the main difference being that the horizontal layout of the subdials at 3:00 and 6:00 on the 6S21 are positioned vertically on the 6S11 at 12:00 and 6:00.

Mechaquartz?

Although the 6S21 is not considered to be a mecaquartz movement, this caliber has features that are not often found on quartz chronograph watches. For example, the central chronograph hand has a quick reset via a heart cam reset system. The buttons are made to have a substantial clicking feel to them, similar to what it feels like to engage the chronograph on a mechanical timepiece. The central chronograph hand beats 4 times per second.

Accuracy:

Miyota states the accuracy of this movement to be +/-20 seconds/month.

Chronograph Hands Not Lining Up?

After a battery change, it’s common for the chronograph hand to not line up on the 12:00 mark. If this happens to your watch, perform the procedure below to reset your chronograph hands:

  1. Pull the crown out to time setting position (two clicks)
  2. Press the top pusher until the chronograph hand is lined up
  3. Push the crown back in

Replacement Price:

At the time of this post, replacement prices for the 6S21 were found in the range of $22.95 to $29.95 USD.

Additional Resources:

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11 Comments
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Luciano E.
Luciano E.
3 years ago

Lots of the Zeppelin watches use this movement. The Los Angeles range for example.

Raffaele
Raffaele
2 years ago

VRATISLAVIA CONCEPTUM CONCEPTUM HERITAGE CHRONO S.15

Josh M.
Josh M.
2 years ago

The new Bulova Archive Series ‘Chronograph A’ features this movement

M A Hamill
M A Hamill
2 years ago

Excellent and informative leaflet.
T W Steel (TW 412) uses this movement.

Alessandro Izzo
Alessandro Izzo
1 year ago

Gigandet supergraph

Jim
Jim
1 year ago

PANZERA AQUAMARINE QUARTZ CHRONOGRAPH

Oleg Solomonik
Oleg Solomonik
5 months ago

Looks like not most common movement. The only thing I don’t understand if this is high beat movement with sweeping seconds hand like Seiko VH31?

Michael Z.
Michael Z.
4 months ago

Geckota chronograph

Mason
Mason
3 months ago

Dan Henry 1939

But it doesn’t use the date wheel.

abkuzma
Member
2 months ago

Bulova Maquina Marc Antony 96B407 uses this one.

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