16 PIANO FROM CASABLANCA, 1927 SOLD: $3.4m (£2.5m)

The iconic props of Hollywood have enduring appeal, as the Moroccanstyle piano from the 1942 Warner Bros film Casablanca illustrated when it sold at Bonhams New York in 2014. Though it has wood and plasticine keys, and is on wheels, the instrument on which Sam (actor/singer Dooley Wilson) ‘played’

As Time Goes By fetched an astronomical sum.