The Union Jack with a central medallion that carries the portrait of Queen Elizabeth II and is dated 1953. Dimensions: 35 x 55 cm. The flag described is a specialised Queen Elizabeth II commemorative or jubilee Union Jack. These custom flags, which feature a central printed medallion, crest, or photo of the Queen surrounded by the national crosses, were predominantly produced as editorial souvenirs, for royal jubilees, or to honour her passing.
mmr-00078 > British Coronation Flag, Fabric, 1953
You can see this exhibit up close, along with many others, in the 3rd-floor exhibition room of CVAR.