A rare, stainless steel Seiko 6139-6000 Proof-Proof "Cevert" chronograph wristwatch circa 1970 (Feb). Model reference 6139-6000. 41 mm case with notched crown guard, blue and red tachymeter aluminum bezel insert. Automatic self-winding mechanical movement 17 jewels. Black dial with luminous index markers, 30 minute counter at 6 o'clock and day/date display at 3 o'clock, rare 6030T dial, with mineral crystal glass. Intergrated steel "H" link bracelet with folding clasp closure. Watch only. In working order. The Seiko 6139 automatic chronograph the first automatic chronograph in the world, This varient has one particluar connection to Formula One racing legend, Francois Cevert, who wore a simular beautiful early-70's matte blue like this one whist beinf sponsored by Seiko in the early 70's, with the very desirable Proof text found on the earliest notch cased examples. The 6000 suffix denotes this one was sold on the Japanese domestic market.