Sight, Front ORIGINAL Winchester 75D - This sight fits into the standard Winchester 0.375 (3/8 inch) female dovetail and has a post that is .36 inches tall and a base that is .5135 inches wide. This front sight was used when greater post height wasnecessary on the Winchester Model 1903 and other 22 rifles such as the Model 53 55 61 62, 63, 64, 65,74 and the later production 1890 -- this sight is the same as the 75A, but has a slightly higher blade height. Many of the later production rifles had this special order sight put on at the factory.