OMEGA chronograph Speedmaster so called 'Mark IV Professional', self winding, reference 176.0012, Switzerland around 1980, solid stainless steel case including original bracelet, screwed down case back with Seamaster Logo, display of hours, minutes, constant second, day, date, 24-hour & chronograph, mineral crystal with tachometer graduation scratched, movement copper coloured, 17 jewels, central rotor, calibre 1045, flat rim balance, flat hairspring, Kif- shock-absorber, measures approx. 45 x 42 mm, length approx. 19,5 cm, condition 2, literature 'Reise durch die Zeit' written by Marco Richon page 612

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