Omega, a gentleman's stainless steel Seamaster automatic calendar chronograph wristwatch, 1970's,

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Omega, a gentleman's stainless steel Seamaster automatic calendar chronograph wristwatch, 1970's,
petrol blue dial signed Omega, Automatic Seamaster, baton five minute markers, date aperture, subsidiary constant seconds and combined 24-hour dial, hour recording dials, outer tachymeter dial, large brushed steel case with screw back, 41mm.