The TWIST LoCK watch is a three piece modular designed where the pieces fit into each other twist locking in place, allowing customers to personalise and interact with the watch. Designed around a Circular Economy business module of Make/Use/Reuse-Recycle. It is constructed from recycled plastic to not only reduce current plastic waste but also the carbon footprint during manufacture. The three pieces of the case are interchangeable so old can be changed for new via a cash back scheme. The idea is that the returned parts are recycled to produce new, truly making the watch circular in design.