This was part of my backup Nikon F4S, but having shot very little film these past 3 years, I am letting this go ... the pics show the new batteries that were installed, and some shots of the back itself when it is powered up. The film side as seen in pic 3 shows that it is in pristine condition and this back saw maybe 3 or 4 rolls after I acquired it (the prior owner sold me a 26 serial number F4S in mint condition, so I don't think he used it much either). The battery compartment is super clean since I always stored the back without any cells in it. It is quite the gem, if you can put it to good use. Reasonable offers will be entertained, please ask all questions before you place your order.