Original Apple battery door/cover for the original Macintosh 128K, 512K and beige version of the Macintosh Plus. There are various interchangeable versions of the battery door including two different battery icons on the front, some with 2 pieces of foam inside and one without. This variant has the smaller battery icon and has the foam pads on the back. Some bear the same part number as the v1 and v2 doors, and some have a later part number.
This B-grade item will have moderate yellowing of the outer surface of plastic due to age and will require Retrobrite treatment to restore it to the original colour.