Looking for information on Robert BROWN, DFC DFM, (173108), RAFVR. His London Gazette entry for DFC, 8/12/1944:5635, lists him as previously being awarded the DFM, I've checked the London Gazette for previous entry's on his service number and found just one on 5/9/1944:4168, which gives his promotion from Pilot Officer to Flying Officer, he is listed without a DFM.
Two DFM entries for Robert BROWN.
Robert BROWN, (952445), 78Sqn. London Gazette 5/2/1943:651.
Robert BROWN, (1034079), 100Sqn. London Gazette 12/11/1944:4973.
My thoughts as I've not found a London Gazette entry concerning an amendment to the DFC entry, is choice one, or a London Gazette entry mistake.