Harley Davidson Pewter Knucklehead Medallion Black Shot Glass 1940 Harley Landmark Engine Series showing 1940 Harley-Davidson 61 OHV Twin KNUCKLEHEAD SHOT GLASS Fine Pewter Medallion is carefully handcrafted and mounted. The shot glass is finely designed collectible and is enhanced with 22 kt. Gold accent. These were Introduced in 1993 during Harley's 90th Anniversary.