Wikipedia, citing Abbott, Peter E and Tamplin, John (1981). British Gallantry Awards (2nd ed.). Nimrod Dix and Co, London ISBN 9780902633742, says "The name, rank, service number and ship of the recipient are engraved or impressed on the rim of the medal." and doesn't note any change in policy during WW2, so I think they will all have been engraved/impressed.