7009-3131] considering buying this vintage day date and I'm quite new to collecting watches so I was wondering if it's a good idea, and if there's a way of authenticating the authenticity
Seiko 5 Automatic 7009-3030 – Timela
Seiko Cal. 7009 7009-3040 Watch Automatic Day Date 1 15/32in Not Working 3WC | eBay