S MORDAN & Co

I have just purchased a beautiful "S Mordan & Co makers & patentees" silver propelling pencil, but it doesn't have any hallmarks? just the name mentioned! Its very ornate! engine turned barrel with with lovely ornate shoulders! It has a pale yellow stone inset into the end with Mary written backwards engraved into it. It has a single letter H on the barrel? It works beautifully & is in A1 condition! Could you help with info on its age or on the lack of hallmarks & the letter "H"