Canon Data Back A for use with A-1, AE-1, AT-1 cameras. Replaces the normal camera back. Comes in the box with case and some sticker labels. The back is very clean and I suspect it has seen little use. CAUTION: the door seals do need to be replaced which can be seen in the photos. They are foam rubber and prone to deteriorate over time even if the back has not been used. It is very easy to do.