This is an original WW2 Battle Of Britain Era 1939 Dated Howard Butler Ltd. D.C. Voltmeter Gauge. This example is in very good condition all round with only minor wear. There are no cracks or damage to the casing and it is full marked up for the Air Ministry with the date of 1939. We are unsure if this example still works as we have now way of testing it at the moment. Sold as seen.