Seiko Chronograph 6138-0040

Seiko. An unusual stainless steel automatic chronograph wristwatch with day and date Bullhead, Ref.6138 0040, Case No. 603668, made circa 1973

Cal.6138B self-winding 21 jewel movement, matt black dial with applied tritium baton indexes, white minute track, blue subsidiary dials for 12 hour and 30 minute chronograph registers, apertures for day and date in English, white/luminescent hands, orange chronograph seconds, substantial polished and satin finished case with screw-down numbered reverse, black tachymeter bezel, winding crown at 12 position flanked by chronograph pushers, on stainless steel Seiko Ref.ZC40S bracelet with folding clasp. Case, dial and movement signed. Diameter 43mm.