Omega Seamaster Jumbo 39 mm Caliber 752 Runs and keeps time flawlessly Day-Date Features a massive 39 mm case size. Comes with a handmade leather strap. Will be shipped with an Omega-branded leather case. On these models, the calendar quick-set function is activated by advancing the hands past 12, turning back to 9, and then moving forward to 12 again. A very clean model you will love. Will be carefully packaged and shipped via UPS for the fastest delivery.