Seiko Caliber 5y23a

Seiko Caliber 5Y23A

Seiko Caliber 5y23a

Brand Seiko
Caliber Number 5Y23, 5Y23A
Movement Type Quartz
Lignes
10.5”’
Outer Diameter
25.4mm
Inner Diameter
19mm x 22mm
Casing Diameter
23.3mm
Height
2.7mm
Jewels
1
Frequency
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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18 Comments
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J.M.
J.M.
10 months 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!

Kenneth
Kenneth
10 months ago
Reply to  J.M.

I like the rounded date window on your watch.

J.M.
J.M.
10 months 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
9 months ago

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

Neil
Neil
8 months ago

Morning
Does anyone know where I can get a replacement Seiko 5Y23A movement?

Thanks for your time

Alex
Alex
7 months ago
Reply to  Neil

Replacement for 5Y23A – I am looking for the same.

Thomas
Thomas
6 months ago
Reply to  Alex

Same for me

Seikocollector
Seikocollector
6 months ago
Reply to  Neil

Did you guys try ebay for replacement movements or watches being sold for parts/repair? Other than that you’re probably not going to find this movement for sale.

Neil
Neil
6 months ago
Reply to  Seikocollector

Hello
Yes I have purchased a movement from ebay when it arrived its in bits, if it had been whole then I would have been able to take it apart but I have no clue how to assemble the box of bits… Has anyone an exploded diagram of the 5y2a movement?

Thomas
Thomas
6 months ago
Reply to  Neil

I Need that too, I also have no clue how to rebuilt it, I’m in a similar situation

Neil
Neil
6 months ago
Reply to  Thomas

Hi Thomas, I have found a diagram showing the assembly and disassembly of the 5Y23
Let me know if it helps?

Thomas
Thomas
6 months ago
Reply to  Neil

Yes, thanks

Thomas
Thomas
6 months ago
Reply to  Neil

Can you send it please? Thank you, I appreciate that

Seikocollector
Seikocollector
5 months ago
Reply to  Thomas
Thomas
Thomas
5 months ago
Reply to  Seikocollector

Thanks, appreciate this

Thomas
Thomas
6 months ago

Is there a movement that can replace this one? I have the same watch and movement as the ones in the photos but the movement doesn’t work, il looks perfect (like new), but doesn’t work, I’m planning to disassembly it and see if there’s something wrong, can someone post a video or photos of the movement disassembled with all the steps to reassemble it? (I’m a novice, this is the first watch that I’m repairing)

Thomas
Thomas
6 months ago

Is it gold plated?

Prabhu K
Prabhu K
17 days ago

Does this 5Y23 have low battery warning feature?

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