@tantanus 

I don’t know much about this sort of thing, but to me, the “G” looks looks like someone carved it in afterward. It does not look like the mark of the luthier. Looks like owner carved, maybe for identification.

From other violins I have seen pictures of that were rated as student and not worth much value-wise, this looks like one of those. The fingerboard does not look, to me, like good quality. I don’t think ebony would look like that, even after many many years of use.

AGAIN, this is just my opinion. I am not trained, I am not even a novice appraiser. Not my interest. I am just going by what I have seen and read. I could be missing something in my zooming up on the photos. Don’t do anything based on what my thoughts were when looking. 

It may still be valuable to you in a family sense. It has been in the family for a while, and that may have some non-monetary value to you, or someone else in your family. There is nothing wrong with treasuring something for that value, and could be more important than any monetary value.