I would guess that it depends on where it is. The photos suggest that it has quite a bit of rust pitting and someone painted it white. On the other hand, it looks like it is not beat up and repaired.
I have one that is very similar, but it IS broken in several places and it has been worked hard for many years. It has hit too many immovable objects too many times.
Trip loaders are a lot better than no loader at all, but are not nearly as useful as a loader that has a hydraulically controlled bucket. A trip bucket loader is worth lots less.
If the loader wasn't too far away, I would be interested in it, since it looks like it would easily replace my damaged loader. I am guessing it would be worth a couple hundred dollars. But like everything else, it might be worth more to the right buyer. Where are you?