SOLD: Vintage Seiko 7123-823B SQ quartz sport 100. Watch is used and has some marks but is in a very good condition for it's age (1981)! Completely original. Battery is recently renewed, runs great. Crown closes with full turns, bezel rotates free. Lume is still great! Appears to have not been...

My very first watch bought in 1981. Has stopped and needs a new movement. Any sources?