Early Mordan & Riddle pencil. Fully and clearly hallmarked for London, 1831 (SM GR). Hallmarks are inverted relative to “SMGR”. In excellent condition and mechanically perfect. Wafer seal. Terminal unscrews for lead storage.
"S. Mordan & Co. Makers & Patentees", "SMGR", "hallmarked for London, 1831