Fox: Manufactured prior to 1907 WITH Damascus barrels
Of Ansley Fox, Michael McIntosh's book, Best Guns, states, "The 1898 Baltimore city directory lists him as president of the Fox Gun Company, 5 West German Street."
Of Damascus-barreled guns, Mr. McIntosh goes on to say about Fox, "An item in the premiere issue of The Sporting Goods Dealer, October 1899, says: 'The Fox shot gun, invented and patented by Ansley Fox, one of the most promising young trap shots of this state, is being manufactured here now, but the trouble is that he can not manufacture guns fast enough to supply the demand.' At least a handful of these guns still exist: twist-barreled, 12-gauge doubles stamped 'Fox Gun Co. Balto. Md. U.S.A.' on the left side of the frames."
If, indeed, your Fox has Damascus barrels, then it may be quite a rarity, and accordingly valuable. Please consult a knowledgeable gunsmith ASAP.
Good luck!