2 in 1 Amps Volts, Ammeter Voltmeter Indicator, 14873, Model 128
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2 1/4", 2 in 1 Amps / Volts, Ammeter / Voltmeter Indicator. Manufactured by Bach-Simpson LTD. Model 128. P/N 14873. Requires external shant, (not included). Removed from a salvage aircraft. Plastic knob is missing and there is a hairline crack on casing, left top, see photo.