This vintage lot of 9 NOS AC Coralox insulator spark plugs includes a variety of numbers, including 1-48X, 1-44-5, 2-46 there is two different stye as one say's patented coralox and the other say's AC 46 the boxes both boxes are the same. And 5-48,  and 1- 48 which is broken, the last pictured on right in photo's. All of which come with their original boxes. These spark plugs were made in the United States in 1940 and are perfect for collectors of automobilia and transportation memorabilia. The AC brand is well-known for its quality and durability, and these spark plugs are no exception. This mixed lot is a rare find and a great addition to any collection. See Photo's as to Condition of Plugs and Boxes.