Robert Opie 10KEY112 Cadburys Milk Chocolate Keyring. Approx 1.75T""x 2.5""T. A metal enamel with attached keyring. It features a full colour illustration for a vintage advertising campaign showing a young girl pouring 2 glasses of milk into a bar of chocolate. Wording "" Cadburys milk chocolate, 1 1/2 glasses of full cream milk in every 1/2 Ib slab, specially packed for export"".