I have bench mounted belt sanders that I use frequently. I also have a Makita 4 X 23" belt sander, and the last time that I used it was maybe 4 years ago. In 15 years I think I have only used it about 4 times, so I think if it disappeared, I would likely not miss it for a very long while. It's not good for flattening a wood panel. Drum sanders and random orbit sanders do that much better.
That sander in the picture looks to be over 50 years old, and from my experience, it may have very few running hours on it But do you really have a good use for a hand held belt sander? I sure haven't found a good use for mine. Maybe you could clean up this antique and start your own woodworking tools museum.
Central North Carolina