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This big stainless steel Omega Constellation f300 Hz chronometer with TV screen dial is a massive watch with original bracelet circa 1970. The cal 1250 movement is Electronic (not quartz), it is powered by a tuning fork which vibrates 300 times per second and is very accurate. Watch has been serviced by our watchmaker. Photos are not actual size of watch, the case measures 36 mm across and bracelet on largest setting fits 22 cm (8 1/2 inch) wrist.