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Difference between Seiko SRPD91 and SRPD65K4

Posted: Sat Nov 28, 2020 9:04 am
by hs1911
Hello.

I cant find any differences between watch from official seiko 5 sports page SRPD91 with green-olive nylon nato strap, and Seiko SRPD65K4. Can anyone help? Is there a difference in the colour of case? Is nato strap the same on both? I really dont get it.