1971 Seiko 6119-6400 Automatic 5 Sports 70m Sport Diver (UFO)
New Glass Crystal For Vintage Seiko6138-0040 Bullhead 6138-0011 Ufo 340w14gn - Repair Tools & Kits - AliExpress
Service Notes From Working On The Seiko 6138B - Cases And Bezels
Update Seiko 6138 UFO Service | WatchCrunch
Seiko 5 Sports Speed-Timer UFO chronograph stainless steel gentleman's bracelet watch, ref. 6138-0011, serial no. 163599, later bracelet, 44mm (in need of repair)
Service Seiko Chronograph (UFO) Calibre 6138 – Mitka's vintage watch service .
For J.S. -- Seiko 6138-0011 UFO "Yachtman" Service - YouTube