Seiko Credor references – what’s the difference between 2F70-5380, 6730-5330, and all the similar models?

I’ve recently fallen down the rabbit hole of vintage Seiko Credor quartz watches, especially the stunning ones with blue agate dials powered by the ultra-thin 2F70 movement.

While digging around, I’ve come across what seems to be several different references that all look almost identical, which has left me a bit confused – especially as I’m getting ready to buy one myself very soon.

Here’s what I’ve found so far:

🕺 Men’s / unisex models:

• 2F70-5380
• 6730-5330…

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