RD;
First of all, welcome to the Forum!
Several of us have a particular interest in the British Service Revolvers, so I suspect in addition to the responses you have received thus far, others will offer their comments.
Many of these revolvers were unfortunately, "converted" by British firms, perhaps most notably, Cogswell & Harrison. At the time the prevailing wisdom was to do this in order to dispose of war surplus. For a variety of reasons, the "conversions" were ineffective, perhaps even unsafe in retrospect. It is regrettable but, at the time no one considered the future historical relevance of a revolver that was produced in enormous quantities, chambered in a cartridge (.38 S&W) which held little appeal to U.S. consumers.
That being said, the potential restoration in my opinion, would be far more expensive than it's value. As an aside, since your Dad left this revolver to you, why not leave it as it is, as he owned it? It's value is sentimental, that's all. Beyond cleaning it and perhaps finding a better quality pair of grips, a safety inspection by a qualified gunsmith is good advice if you intend to shoot it. Stick with low pressure loads and no +P ammunition.
You have what we refer to in good humour as, a BBQ or Pimp gun. Maybe a pair of pearl stocks would finish her off just right for the next round of brisket! The history is interesting, hang on to that and your Dad's memory!
Happy Holidays!