Most likely, yes. The maker's initials stand for Charles Asprey and George Asprey. The Asprey family of silversmiths goes well back into the late 1700s. The company operated under may different city marks over the years, with the "CA GA" mark coming from London in the late 1890's. The lower case "h" is for the year 1903. You didn't mention it, but the "shield" that you mentioned should have a face of a leopard (cat heat shape) in it. If so, that stands for the city of London. You can check the marks against the database of marks and images at either the Encyclopedia of Silver Marks, or the Silver Collector website to verify that I am correct.