Seiko Sea Lion Weekdater M55 6206-9000 from 1966 | Vintage watches, Watches for men, Vintage seiko watches
The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling
GENUINE NEW OLD STOCK VINTAGE SEIKO SEA-LION M55 14097 EGP 20MCR CASE SET | eBay
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.