Eyepiece shutter - little plastic/rubber widget... I've got 'em, I've never used 'em. If I'm going to take the time and trouble to set my camera up on a tripod and attach a remote cable, I'm also going to set it to Manual and use an external light meter.
I almost died laughing when I first saw the hot shoe cover/eyepiece blind/battery door lever that came with a friend's A-1. He broke one of the two tiny tabs that hold it onto the eyepiece, rendering it unusable, so he threw it away. A few years later he was wondering why they made the battery door so hard to get open.