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A rare pocket compass by George Adams senior circa 1770

A pocket compass by George Adams senior circa 1770, issued by the board of ordnance, circa 1770 the 13cm paper dial signed around the needle pivot made by G.Adams in Fleet Street London, brass degree ring, blued steel needle, contained in square mahogany case with hingedĀ  lid, impressed by dial and no lid 313 BĀ  O and an arrow.