Vintage Seiko SQ Quartz Japan Movt No 7123 8519 P FORPART/REPAIR/WATCHMAKER#. | eBay
Can this Seiko 7123 Movement Be Repaired? | WatchUSeek Watch Forums
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