A2S4000 & A2S4100
Apple IIc keyboard ground clip that attaches to the internal disk drive shield. This is used for later keyboards that have a metal strip that sticks out the top (last photo). The early keyboard (middle photo) had a pcb tab that stuck out to sit in that slot in the disk drive shield and no clip. The screw that holds it on is already in your shield, so this is just the clip.