SEIKO so called BULLHEAD chronograph, Japan around 1970, self winding, reference 6138- 0040, screwed down stainless steel case, original bracelet with deployant clasp, tachometer graduation, 2-coloured dial with luminous indexes, luminous hands, day & date, calibre 6138B, 21 jewels, measures approx. 44 x 45 mm, length approx. 21 cm, condition 2, property of a collector