The Ithaca Model 500 is a Japanese-made over/under shotgun manufactured by SKB and imported by the Ithaca Gun Company between 1966 and 1979. Overview and Specifications * Type: Over/under break-action double-barrel shotgun. * Manufacturer: SKB (Japan) for Ithaca (USA). * Gauge: 12GA * Features: Known for scroll engraving, good balance, selective ejectors, and a barrel selector on the trigger.