![1966 Seiko “Sea Lion” M55 Weekdater Automatic 37mm (Japanese 1st Generation Day-Date) DiaShock, Luxury, Watches on Carousell 1966 Seiko “Sea Lion” M55 Weekdater Automatic 37mm (Japanese 1st Generation Day-Date) DiaShock, Luxury, Watches on Carousell](https://media.karousell.com/media/photos/products/2021/4/21/1966_seiko_sea_lion_m55_weekda_1619018953_d1f6f26a_progressive.jpg)
1966 Seiko “Sea Lion” M55 Weekdater Automatic 37mm (Japanese 1st Generation Day-Date) DiaShock, Luxury, Watches on Carousell
![The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2017/04/seiko-6206-weekdater.jpg)
The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling
![Seiko DX Sea Lion M55 Weekdater split day-date für 298 € kaufen von einem Privatverkäufer auf Chrono24 Seiko DX Sea Lion M55 Weekdater split day-date für 298 € kaufen von einem Privatverkäufer auf Chrono24](https://cdn2.chrono24.com/images/uhren/28504661-o1898ouxh6pu366nso6q1bol-ExtraLarge.jpg)
Seiko DX Sea Lion M55 Weekdater split day-date für 298 € kaufen von einem Privatverkäufer auf Chrono24
![Sea lion] [m55] [6206-8001] weekdater 26 jewels. Still works. I picked up this watch from a moving sale. I didn't think much of it until I found it again in my stuff. Sea lion] [m55] [6206-8001] weekdater 26 jewels. Still works. I picked up this watch from a moving sale. I didn't think much of it until I found it again in my stuff.](https://preview.redd.it/sea-lion-m55-6206-8001-weekdater-26-jewels-still-works-i-v0-ql58qdqd6fua1.jpg?width=640&crop=smart&auto=webp&s=75fc823105eae7c4cab0af37b1d2a33b22dbe31f)
Sea lion] [m55] [6206-8001] weekdater 26 jewels. Still works. I picked up this watch from a moving sale. I didn't think much of it until I found it again in my stuff.
![1966 Seiko “Sea Lion” M55 Weekdater Automatic 37mm (Japanese 1st Generation Day-Date) DiaShock, Luxury, Watches on Carousell 1966 Seiko “Sea Lion” M55 Weekdater Automatic 37mm (Japanese 1st Generation Day-Date) DiaShock, Luxury, Watches on Carousell](https://media.karousell.com/media/photos/products/2021/4/21/1966_seiko_sea_lion_m55_weekda_1619018917_9ad55189_progressive.jpg)
1966 Seiko “Sea Lion” M55 Weekdater Automatic 37mm (Japanese 1st Generation Day-Date) DiaShock, Luxury, Watches on Carousell
![The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2017/04/day-and-date-driving-wheels.jpg)
The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling
![Seiko 6206B installed in a Seiko Sea Lion M55 Week dater from 1966 | Seiko diver, Seiko, Seiko watches Seiko 6206B installed in a Seiko Sea Lion M55 Week dater from 1966 | Seiko diver, Seiko, Seiko watches](https://i.pinimg.com/736x/ba/00/8f/ba008f47268c2e7829564b4a7c2615b5--sea-lions.jpg)
Seiko 6206B installed in a Seiko Sea Lion M55 Week dater from 1966 | Seiko diver, Seiko, Seiko watches
![The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2017/04/seiko-6206-9000.jpg)
The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling
![Vintage Seiko Sea Lion M55 Automatic Watch Jan.1967, Men's Fashion, Watches & Accessories, Watches on Carousell Vintage Seiko Sea Lion M55 Automatic Watch Jan.1967, Men's Fashion, Watches & Accessories, Watches on Carousell](https://media.karousell.com/media/photos/products/2022/7/8/vintage_seiko_sea_lion_m55_aut_1657262315_3ff486aa.jpg)
Vintage Seiko Sea Lion M55 Automatic Watch Jan.1967, Men's Fashion, Watches & Accessories, Watches on Carousell
![The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2017/04/seiko-6206-weekdater-dial.jpg)
The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling
![The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2017/04/sealion-m55.jpg)