A second world war 'Alco' Steam Charging Set, Firefly Model, output 6/8 volts, 4 amps, built by Arthur Lyon & Co Ltd Serial No 57928, 1944 with Stuart Sirius twin cylinder enclosed crank high speed engine with direct coupled dynamo, with over mounted ammeter, in khaki coloured metal carrying case -- 7½ x 15in. (19 x 38cm.)