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Seiko bracelets have two diferent size of tube. There's the Type C and Type P from memory.
I think the Type C have a split along their length so they can expand and the Type P are in the form of a manifold tube. You probably have Type C but its easy to check.
Just give Seiko Service Center a call and they should sort you out https://www.seikowatches.com/uk-en/contact/servicecenter
How do i find a replacement? Which collar does my Seiko use?
@Stonehedge @Regal
Anyone with knowledge of seikos and their damn collar pin system....