Audemars Piguet Royal Oak Quantieme Annuel 25920ST Blue DialThe only RO annual calendar Not only does the Royal Oak turn 50 year, there was also a RO themed sale this past week at Phillips that saw record prices achieved for this iconic watch. We are delighted to offer this stunning Royal Oak annual calendar, as we believe the only annual calendar to ever be offered by Audemars Piguet. The blue grande tapisserie dial is in superb condition with the date around the outer edge and an unusual month indicator sub