SEIKO 5 Sports intermediate wheel chronograph Speed-Timer, self winding, Japan around 1970, reference 6139-6031, stainless steel case including original bracelet with deployant clasp, screwed down case back, 30 minutes- & 12 hour-register, day & date, tachymeter- bezel, dial due to age patinated/spotty, bidirectional revolving inner bezel with 60- minutes graduation, 21 jewels, calibre 6139A, central rotor, stoßges., measures approx. 47 x 41 mm, length approx. 19 cm, overhaul recommended at buyer's expense, condition 3, property of a collector