Basically it all depends on what you want out of this rifle. "Worth" it to restore? Depends on how far down the restoration rabbit hole you are and what your objective is. Restoring it won't add much net value to the gun if that's what you're asking -the final value will more or less be the sum of the current value and the parts you put into it - but it would also likely be easier to sell down the road if that's what you end up doing. It's a neat gun with some neat history but it isn't going to be a big collector's item.
That said, if you just want to put it back into a military configuration you could manage for not crazy amounts of money. Get a replacement stock, put on some military stock bands, and you're most of the way there. Replace the bolt body with one that hasn't been turned down at your discretion.
FYI the antlers that Fal Grunt mentioned are the acceptance mark for the German Kingdom of Wurttemburg. Long story short, in the imperial era the kingdoms that made up the German empire maintained their own militaries which fed into the larger imperial apparatus. The Mauser factory at Oberndorf (where your gun was made) supplied arms to the Prussian military but also did contracts for Wurttemburg, the kingdom that the factory was in. They're not as common as ones marked for Prussia, so rifle nerds tend to perk up a bit when we see one.
Neat gun, sorry to hear about your dad.
In your shoes I'd probably turn it into a project, getting it back into military trim, but it wouldn't be a money making endeavor. Not terribly expensive, though - under $500 for certain unless you got really particular about parts.
