1950s to 1990s mounted collection of various types of machine-issued postage paid imprints and labels off and on piece and on covers, with 1950s Ticket Issue Machine trials for Parcel Post, 1960s to 1980s National Cash Register labels, including varieties and errors, 1970s and 1980 Pitney Bowes Postage Paid labels, also 1990s Adelaide trial of Pitney Bowed cancelling dies, and Postal Charges Calulators labels. A fascinating study of recent and modern postal history, which would be impossible to duplicate (100s)