Abstract: A case assembly is provided including a pair of closely juxtaposed open-sided case halves opening toward each other and defining remote pairs of opposing marginal edge portions. Hinge structure pivotally interconnects one pair of the edge portions for relative angular displacement of the case halves about an axis extending along the one pair of edge portions and swinging of the other pair of marginal edge portions away and toward each other. The hinge structure includes adjustment structure operative to adjustably laterally displace the axis of relative angular displacement of the case halves outwardly from and back toward the open side of one of the case halves while maintaining the axis stationary relative to the other case half.