Audemars Piguet Royal Oak Offshore Black Dial Chronograph Mens Watch Diamond Weight: Product SKU/UPC: 26170ST. We only sell 100% natural diamond watches. The free listing tool. The item “Audemars Piguet Royal Oak Offshore Black Dial Chronograph Mens Watch ap55″ is in sale since Saturday, September 1, 2012. This item is in the category “Jewelry & Watches\Watches, Parts & Accessories\Wristwatches”. The seller is “jnsluxury” and is located in New York, New York. This item can be shipped worldwide.