Seiko 'Bullhead' Chronograph automatic stainless steel gentleman's bracelet watch, ref. 6138-0040 circa 1970s, serial no. 776724, circular black dial with baton markers, Arabic/English day and date apertures at the six position, blue
271: SEIKO, 'Bullhead' chronograph wristwatch, Ref. 6138-0060T < Important Design, 10 June 2021 < Auctions | Wright: Auctions of Art and Design
Band for Seiko 6138-0040 6138-0049 Fishbone Bracelet Z040S Bullhead St – A parts
A Time When Seiko Made Amazing Watches - Seiko 6138 0040 Bullhead - YouTube