This is a Seiko M929-5010 from July 1980 and is in near mint condition especially for its age. Well made and slimline it fits nice on the wrist. At first a segment was not working in the display but a quick strip down and clean with alcohol the circuit board and now it works perfectly. As a stopwatch, a count function which I have not seen before and then the usual light, day & date function.
Cracking LCD watch this one.