Overlay sheets used in the creation of coloured maps require perfect registration. Initially, this was achieved by adding a series of simple crosses to large drawing sheets and using ‘Peg bars’, of the type used by hand-drawn animators, for smaller page work. Later, as wider registration punch systems and separate pins became available, it was possible to punch register larger sheets of drawing material and film. This culminated in the 1990s with A-Z using an offset printing plate punch and Protocol register pins – part of a workflow which maintained registration accuracy from drawing sheet to printing plate. Used in pairs, one round peg and one rectangular, these stainless steel pins were often personalised by draughtsmen as seen here.