If you see sanding scratches 'under' the varnish, it was sanded and re-finished. The bass looks re-finished all over.
The back wood (grain) looks like it could be plywood but I would need to see good pics of the edges to be convinced either way.
The bass however is an old German/Czech factory bass like the 1,000s we have seen imported here and used around the world.
Value is hard to quote from pictures as the actual condition internally has to be inspected. Repairs can sometimes exceed the value of the actual bass. I have a bass here now not too different than yours that needs a full restoration. Mine I think was made on the Czech side on the border so I call it
Bohemian, being made possibly before the first war.
Since you are not all that far from me, you can bring it over on day if you like. Then I can figure the rest out.