Seiko 5 automatic 7009-3040 F for $184 for sale from a Private Seller on Chrono24
Seiko 5 Automatic Watch - 7009-4040
Seiko 5 7009 4040 defekt läuft nicht Datum schaltet | WatchCharts
GENTLEMEN'S SEIKO 5, REF. 7009-4040, BLUE DIAL, CIRCA - Mar 28, 2019 | Sterling Vault Auctioneers in United Kingdom
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