I used to own one. The Ithaca/SKB 400 and the Model 480 (480's have a straight grip and a slimmer beavertail forend than the 400's) were SKB's top-of-the-line side-by-sides imported by Ithaca c. the mid to late 70's. Back in the day, the line up of SKB S X S's were the Model 100, 150, 200, 280, 400 and 480. Later guns were then imported by a couple of different importers and a Model 300 was added to the line.