PO-Orient Lines Luggage Labels | Jock Kinneir Library PO-Orient Lines Luggage Labels c.1957 A suite of labels coded by shape, pattern and colour to be read by people of different languages and levels of literacy around the world. PO Luggage label, an early project Margaret Calvert was involved with, 1957 As reads in the 1971 Kinneir Calvert Tuhill brochure: 'Baggage destination labelling system.