Can lid and method for producing a can lid

A can lid comprising:

• a metallic lid surface in which an opening is formed which is bounded by a closed margin of the metallic lid surface and which is closed by a closure piece of the metallic lid surface, wherein the closure piece is separated from a surrounding metallic lid surface by a microgap extending at least sectionally along the closed margin of the metallic lid surface, wherein a margin of the closure piece and a margin of a surrounding portion of the metallic lid surface adjoin one another at the microgap, and wherein the closure piece can be moved out of a plane defined by the opening to release the opening;
• a layer composed of a plastic material which is applied to a flat side of the metallic lid surface in a manner covering the microgap;
• and
• wherein the margin of the closure piece and the margin of the surrounding metallic lid surface are offset from one another transversely to the plane defined by the opening.