The amount of antioxidants in navel oranges is very similar to common oranges such as "white", "round", and "blond" varieties which account for the majority (two-thirds) of the total crop production.
ORAC Source
USDA Database for the Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 - Prepared by Nutrient Data Laboratory, Beltsville Human Nutrition Research Center (BHNRC), Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA) - May 2010