Assuming it has double triggers and is an extractor gun you will find it to be about bulletproof. None better. Probably has fluid steel barrels too. What is the frame size? You'll find a number on the bottom of the back lug denoting the size. It'll probable be a 1 1/2 or 2 frame. One frame 12's are somewhat uncommon though I have two. If it hasn't been altered it will have 2 5/8" chambers and 2 3/4" ammunition was recommended by Parker. While it will handle most any off the shelf ammo it is wise to keep pressures down similar to what you're feeding the Fox. Just being kind to a 110 year old gun, besides you don't gain anything with high pressures.
Good shooting!
