My jeweler told me that this is the same omega the prince of England wears. OMEGA Seamaster 300M Midsize 2263.80.00. 10-10-OME-BE67S NOTES:This OMEGA Seamaster 300M Midsize 2263.80.00 is in overall excellent pre-owned condition with some light scuffs around the bezel.Omega Seamaster Wristwatch. Needs new battery. 

One stainless steel Omega "Seamaster" 300M Midsize wristwatch. Quartz Movement, Date, Blue Dial, Serial Number 58084418, Luminous Markers, stainless steel band, Value around $2200 to $3000. Gently worn, band could use a polish. Fully functional and evaluated by a jeweler.