A '71 Seiko 6139-8020 - the watch that got me into vintage Seiko. I bought the watch itself from Argentina and the NOS strap from Saudi Arabia. : r/ Seiko
Vintage Seiko 6139-8020 Chronograph Automatic Men's Watch Blue Dial Day Date – St. John's Institute (Hua Ming)
Herology on X: "1975 Seiko 6139-8020 “Hexagon” 17 Jewels Chronograph around 39mm wide w/c and 12mm thick which makes this “Speed Timer” much more compact compared to the venerable “Pogue.” 👍👍👍 #Seiko #
BEAUTIFUL SEIKO REF 6139-8020 AUTOMATIC JAPANESE CHRONOGRAPH WATCH FROM Ca 1975 | eBay
Seiko 6139-8020 - YouTube
Seiko Automatic Chronograph 6139-8020 Full Original 1973 Model - Etsy Hong Kong
Seiko Chronograph Automatic 6139-8020 Vintage Circa 1972 for $1,067 for sale from a Trusted Seller on Chrono24