![Vintage Seiko Chronograph ref. 6139-7070 Baby Jumbo – 1977, Seikosis bracelet, Serviced - ChronoTimepieces Vintage Seiko Chronograph ref. 6139-7070 Baby Jumbo – 1977, Seikosis bracelet, Serviced - ChronoTimepieces](https://chronotimepieces.com/ctsitecms/wp-content/uploads/Seiko-Chronograph-ref.-6139-7070-Baby-Jumbo-4.jpg)
Vintage Seiko Chronograph ref. 6139-7070 Baby Jumbo – 1977, Seikosis bracelet, Serviced - ChronoTimepieces
![At Auction: A Vintage Seiko 6139-7070 Chronograph Automatic Gents Watch. Stainless steel strap and case - 40mm. Blue dial with second sub dial. In working order. At Auction: A Vintage Seiko 6139-7070 Chronograph Automatic Gents Watch. Stainless steel strap and case - 40mm. Blue dial with second sub dial. In working order.](https://image.invaluable.com/housePhotos/cadmoreclassiccars/07/755507/H22264-L347230279.jpg)
At Auction: A Vintage Seiko 6139-7070 Chronograph Automatic Gents Watch. Stainless steel strap and case - 40mm. Blue dial with second sub dial. In working order.
![Vintage Seiko Chronograph ref. 6139-7070 Baby Jumbo – 1977, Seikosis bracelet, Serviced - ChronoTimepieces Vintage Seiko Chronograph ref. 6139-7070 Baby Jumbo – 1977, Seikosis bracelet, Serviced - ChronoTimepieces](https://chronotimepieces.com/ctsitecms/wp-content/uploads/Seiko-Chronograph-ref.-6139-7070-Baby-Jumbo-2.jpg)
Vintage Seiko Chronograph ref. 6139-7070 Baby Jumbo – 1977, Seikosis bracelet, Serviced - ChronoTimepieces
![At Auction: A Vintage Seiko 6139-7070 Chronograph Automatic Gents Watch. Stainless steel strap and case - 40mm. Blue dial with second sub dial. In working order. At Auction: A Vintage Seiko 6139-7070 Chronograph Automatic Gents Watch. Stainless steel strap and case - 40mm. Blue dial with second sub dial. In working order.](https://image.invaluable.com/housePhotos/cadmoreclassiccars/07/755507/H22264-L347230298.jpg)