Vintage SEIKO QUARTZ TYPE II 7123-7020 FOR PARTS OR REPAIR WATCH JAPAN | eBay
7123-823F] My dad gave me my first Seiko when I was 18. It's an 80s Sports 100 he used diving. After all these years it's still ticking away with the occasional battery
Seiko 7123-823B Quartz | The Watch Bloke
OK, Your Watch Won't Work With a New Battery, Now What? : Northern Watch Co Magazine