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25 mm DIA , ARROW LINE KNOB, BLACK

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10B/13234, Air Ministry, Index Stops, Vernier Markers, a pair, 2x

10c/13814, black knob, Air Ministry, 21mm Dia.

2X 1970s, Hewlett Packard, HP, black knobs, 16mm Dia, 18mm Height

2x, MARCONI, SILVER PLATED VERNIER DIAL, MARKED 0 - 100, , 77mm DIA,

4x Scale Plates, Knob Verniers, approx 60 mm Dia, Q Max Air Ministry, etc