I think it is an old hand saw sharpener. Not positive thought. Here is your pic, hope you don't mind.
<a href="http://www.flickr.com/photos/107457227@N06/11330961893" title="IMG_2669 by Robert Streitman, on Flickr"><img src="http://farm8.staticflickr.com/7433/11330961893_69d2bf59de.jpg" width="500" height="331" alt="IMG_2669"></a>
