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Seiko Caliber 4M21

Technical information

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Watches with the 4M21 movement

4M21-0010
4M21-0A10
4M21-0A20
4M21-0A30
4M21-0A40
4M21-0A50
4M21-0A60
4M21-0A70
4M21-0A80
4M21-0A90
4M21-0B00
4M21-0B0A
4M21-0B10
4M21-0B20
4M21-0B30
4M21-0B40
4M21-0B50
4M21-0B60
4M21-0B70
4M21-0B80
4M21-0B90
4M21-0C00
4M21-0C10

About “The Seiko Guy”

Hey, nice to see you here!
My name is Andrea Secco, I’m a watch enthusiast and a Seiko collector.
I hope this website will be useful to all of you who share this passion.

Andrea Secco

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This website is the work of a watch enthusiast and a collector of Seiko and Grand Seiko timepieces, and it is not affiliated with Seiko in any way.

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