Near perfect Seiko "Jumbo" (6138-3002)
The Seiko 6139 and 6138 automatic chronographs were Seiko's entry into the automatic chronograph competition between Zenith and Heuer-Breitling-Hamilton in the late 60's, early 70's. Some say that the Seiko 6139 was, in fact, the first. I just got this ne...
case diameter
They are wonderful watches. Condition is everything and I looked a long time before I found this one. I think it's 41-42mm. Can't measure it at the moment, but it's chunky and sizable - especially for that era. It's sits beautifully on the wrist.
Great catch
Rare indeed in such a mint state! It has a few hints of Speedmaster but its own, utilitarian character And you have chosen your strap very appropriately too
