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.
SOLD 1968 Seiko Sealion M55 Day Date - Birth Year Watches
The comfort of familiarity: A Seiko Sea Lion Weekdater from 1966 | Adventures in Amateur Watch Fettling