Seiko Animal Backcover series.
1. Seiko "Turtle" (Sea Turtle Logo) Description: Vintage Seiko Diver’s watches (like the 6309 series) are nicknamed "Turtle" for their cushion-shaped case, but some also have a sea turtle logo engraved on the caseback. Search term for images: "Seiko 6309 turtle caseback logo" 2. Seiko Diver’s (Wave/Sea Horse/Dolphin Logo) Description: Many vintage Seiko divers feature the "Tsunami Wave" logo (a stylized wave), while some older models have a dolphin or seahorse. Search term for images: "Seiko tsunami wave caseback", "Seiko dolphin caseback", "Seiko seahorse caseback" 3. King Seiko (Lion Logo) Description: King Seiko models often have a lion medallion on the caseback, symbolizing high quality. Search term for images: "King Seiko lion caseback" 4. Grand Seiko (Lion Logo) Description: Grand Seiko watches are famous for their gold lion medallion casebacks, representing the brand’s pursuit of excellence....