Audemars Piguet Royal Oak Steel Grey Dial 4100STLess is more? We think so in this case We make no secret of our love for what are known as the mid size Royal Oaks. In fact, we wrote a Spot On article about them here go and have a read! This Royal Oak reference 4100 is in steel and remains in really beautiful condition the case is sharp with full factory lines throughout. This example houses the Stern made petit tapisserie dial in grey that we all know and love and has some gentle patina. Our 4100