Seiko Caliber 5y23a

Seiko Caliber 5Y23A

Seiko Caliber 5y23a

Brand Seiko
Caliber Number 5Y23, 5Y23A
Movement Type Quartz
Outer Diameter
Inner Diameter
19mm x 22mm
Casing Diameter
32,768 Hz
Battery Number
371/370 (SR920SW), 1.55V
Estimated Battery
3 years
Driving System
Step motor (load compensated driving pulse)
Hand Count 3
Hands Sizes
1.1mm / .65mm / .18mm
Functions Central hours; central minutes; central seconds; day-date at 3:00
Country of Manufacture Japan
Known Models
Seiko 5Y23-7089 (Add your watch to the comments below…)

The Seiko caliber 5Y23A is a vintage quartz movement with a day-date calendar complication. Technical documentation for this caliber was found dated June 1988, so this movement was produced at least that long ago.

Similar Calibers:

The cal. 5Y23A shares the same technical documentation as calibers 5Y22A, 5Y30A, 5Y31A, 5Y32A, and 5Y39A.

Although they are all based on the same 5Y framework, there are various differences between them including the following:

  • 2-Hander – 5Y30A, 5Y39A
  • 3-Hander – 5Y31A, 5Y32A, 5Y22A, 5Y23A
  • No Day or Date – 5Y30A, 5Y31A
  • Date – 5Y32A, 5Y39A, 5Y22A
  • Day-Date – 5Y23A

The heights and diameters also vary slightly between the calibers, therefore they may not be fully interchangeable.

  • 24mm Outside Diameter – 5Y30A, 5Y31A, 5Y32A, 5Y39A
  • 25.4mm Outside Diameter – 5Y22A, 5Y23A
  • 2.1mm Thick – 5Y30A, 5Y31A
  • 2.5mm Thick – 5Y32A, 5Y39A
  • 2.7mm Thick – 5Y22A, 5Y23A

Watches with this movement:

The example of caliber 5Y23A pictured above was found in a Seiko watch with a case number of 5Y23-7089.

Seiko 5y23 7089

Additional Resources:

Submitted by JM

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1 month ago

Awesome to see my post up so quickly! I definitely didn’t have all the specs for it, but thank you guys for adding that along with my photos!

1 month ago
Reply to  J.M.

I like the rounded date window on your watch.

1 month ago
Reply to  Kenneth

I really didn’t pay that much mind to the day/date window until you pointed that out. Although they made these a dime a dozen in the late 80s/early 90s, it’s a gorgeous little watch, and it’s very thin.

Ian Watson
Ian Watson
29 days ago

Am I guessing this is the Seiko variant of the Pulsar V733? Or is the V733 the Pulsar version of the VX33?

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