A rare 18th Century lignum vitae and boxwood "Davis" backstaff signed on the makers plaque H. GREGORY near ye India House LONDON Iean Gremon, the boxwood arc with scales and divided 0-25 and 90-65, with fleur-de-lys, star and flower decoration, carved foot(slight damage), the lesser arc with divisions, with boxwood sight - 24¼in.wide