£50
A G.P.O. BRASS AND MAHOGANY TWIN COIL DIFFERENTIAL GALVANOMETER TYPE 1A, TELEGRAPH WORKS SILVERTOWN LONDON, NO 729, DATED 1915 OF ARCHED FORM WITH SILVERED FACE, PAINTED NEEDLE , DEFLECTION 70-0-70, AND FOUR MILLED TERMINALS, 13.5CM H, STAMPED 50[OHM] TWICE AND GOVERNMENT PROPERTY BROAD ARROW
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