A brass miners dial with twin folding sighting vanes, signed on the silvered dial W.& S. Jones Holborn London , with well engraved compass rose, well divided 10-360° and quadrantly 10-80° with edge bar needle and clamp with bubble level on mounting - 7½in.wide
A brass miners dial with twin folding sighting vanes, signed on the silvered dial W.& S. Jones Holborn London , with well engraved compass rose, well divided 10-360° and quadrantly 10-80° with edge bar needle and clamp with bubble level on mounting - 7½in.wide
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