SEIK O CRYSTAL CHRONOMETER QC-951 Seiko, Japan, 'Crystal Chronometer QC-951', No. 10637, Made in the later 1960s. Fine quartz, electronic, center-seconds chronometer. Accompanied by the original fitted box. | Important Modern &
CT078 - Double Dome Sapphire Crystal - Seiko Military style SNZG+ - seikomods.com