About this objectPlaster case - a model used to cast a mould to produce coffee pots. The shape of the coffee pot is imbedded in a plaster block to half way with convex domed locking keys. The coffee pot has a bobble texture around the base and straight sides to a rolled rim and downturned spout. Ear shaped handle on other side. The base of the block has two concave locating keys and the top has three.