Halford Sauce is a dead product that was made in Leicester, England. The American headquarters was in Boston.
It was as common in many American households as ketchup now is. Recipes called for tablespoons of it here and there the way they now call for Worcestershire sauce. In fact, Halford Sauce appears to have lost the bottled sauce battle to Worcestershire Sauce.
Dr J.H. (James) Salisbury recommended it as an accompaniment to his Salisbury Steak.
“Halford Leicestershire Table Sauce. The Most Perfect Relish of the Day. An absolute Remedy for Dyspepsia. Invaluable to all Good Cooks. A Nutritious Combination for Children. Invaluable for Soups, Hashes, Cold Meats, and Entrées.” (1880 advertising)
It was also just called “Leicestershire Sauce.”