In 1973, Colonel William Pogue brought his Seiko 6139 Automatic Chronograph on board the Skylab 4 mission as part of his personal kit. He had purchased the watch from the PX at Ellington AFB, and although the watch wasn’t Flight-Approved by NASA, he was allowed to bring it on the flight.
this is mine:
Seiko 6139-6002, dated JULY 1971
new dial. hands, crystal, seals and bracelet
a very large watch for the era at 42mm wide