This Omega Speedmaster Tripe Day-Date Ref 3520.53.00 is rated 9.7 out of 10. Watch only. The Omega (ref. 3520.53.00) is definitely one of the more colorful and striking pieces from the Speedmaster collection. It features striking red hands, blue (albeit partially) subdial, a date hand with a yellow plane motif, as well as patina-ed numerals. Despite its small size at 39mm, the omega is actually capable of many functions. It includes a Day-Date (and Month) function, a chronograph, a 24-hour indicator, as well as usually time-telling capabilities. The movement that powers the omega is actually a Valjoux 7751-based Caliber 1151, which features a power reserve of 44 hours.