Sweet stove man! I'm somewhat of a collector and have 20ish items from Griswold, a few Wagners and a Martin or two, I love cookwear from the early 1900s.
The one you bought your dad is in great shape. I don't usually see them with the original porcelain handles in such good condition. It doesn't look like this piece was affected by rust or I don't see any pitting, which is also lucky.
With care and a little oil here and there, this will easily last another 100 years. Please update this thread with some action photos of this ole gal cooking something.