I don't know the model name for the brush you have inherited and whether or not it is "worth it" to restore is purely up to you. The original knot was likely 18mm x 45-50mm and could easily be replicated using a TGN Silvertip A or Shavemac Finest depending on your financial situation and preferences. A two band TGN Finest knot would be less expensive and would provide a very nice face feel. If you are wondering if it will increase in value by restoring beyond the cost of the restoration, that is doubtful. If you are looking to make money on the brush just throw it up on eBay or the Marketplace here as is and let somebody else appreciate the depreciation. 
