Side illuminated ammeter made by AC from an old Daimler - Conquest I think but please double check, marked with part number 7228108 and dated 1954. Gauge has been fully dismantled, inspected, cleaned, casing blasted/painted and a new bezel/seals fitted. It has also been tested to 30 amps in both directions so I can confirm it works correctly. All in excellent condition. To fit a 52 mm hole, outside diameter of bezel is 56 mm.