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A Heath & Co oxidised metal sextant, with three circle frame, two sets of three coloured glas
A Heath & Co oxidised metal sextant, with three circle frame, two sets of three coloured glass filters, engraved silver inset scale with vernier labelled Hezzanith, endless tangent screw clamp and vernier, with accessories in fitted mahogany case with, to the underside of the lid, the label of The National Physical Laboratory Teddington, dated 1944
A Heath & Co oxidised metal sextant, with three circle frame, two sets of three coloured glass filters, engraved silver inset scale with vernier labelled Hezzanith, endless tangent screw clamp and vernier, with accessories in fitted mahogany case with, to the underside of the lid, the label of The National Physical Laboratory Teddington, dated 1944
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