Untested i have 3 of these i will sell the cleanest one first than the one with the sticker messed up and last the one with no sticker This vintage Mallory Voltmaster ignition coil (part number 28675) is a rare find for car enthusiasts looking to upgrade their ignition systems. Made in the United States, this high-performance ignition coil is designed to deliver optimal power and reliability to your vehicle. Its brand reputation precedes it, with Mallory Ignition being a trusted name in the industry. This ignition coil is compatible with 12-volt systems and is ideal for car and truck owners who want to improve the performance of their vehicles.