Seiko Chronograph 6139-6002

A Seiko Chronograph Automatic stainless steel gentleman's bracelet wristwatch, Ref. 6139-6002, circa May 1977, with signed and jewelled 6139B caliber movement, the signed silvered dial with subsidiary dial and day and date apertures, the case with blue and red tachymeter scale bezel, the signed case back detailed '6139-6002' and numbered '758549', the tapered bracelet with foldover clasp, case width 4.1cm.