Top and bottom plates designed for the Block II Apollo Guidance Computer (AGC), both featuring X-shaped patterns. The top plate (likely magnesium) measures 21.75″ x 12.5″ x .5″, and the bottom plate (likely aluminum) measures 24.25″ x 12.5″ x .25″. Both cover plates retain their inherent rubber gaskets, designed to hermetically seal the computer's components inside. This X-shaped design pattern is the version that flew on the AGC. In fine condition. From the Don Eyles Apollo Computer Collection.