Thousands of items are available to buy from dealers online. Here we pick out one that caught our eye this week.
A set of eight Second World War ‘Careless Talk’ posters from 1940 is on offer from Twentieth Century Posters, run by dealer David Bownes.
Each says in bold letters at the bottom careless talk costs lives, while incautious speakers are captioned above. In this case, right, one man says to another …strictly between these four walls! while Hitler gazes down.