Abstract: A metal closure for a container includes a center panel, a center-panel ring with a convex curved surface, and an inner leg. The metal closure is provided with a band formed by at least coining to increase the buckling pressure. The band is defined as one of intersecting strain fields. The coining cold-works a total uncoined curvilinear length that includes a portion of the center-panel ring, and that optionally includes a portion of the center panel and/or a portion of the inner leg. In one embodiment, the coining produces two frustoconical coined surfaces. In another embodiment, the coining produces a curvilinear coined surface with a generally constant coin residual.