This episode of the Antiques Roadshow includes a collection of 1930s posters that was bought for 50p in the 1970s. There's a big reaction when the owner is given their current day valuation:
http://www.bbc.co.uk/programmes/b00rvym8
Featured Image: West Indies Cunard Cruises, 1929
Link: http://www.antikbar.co.uk/product_detail/?pId=391
