Make Me an Offer! (1956)

A struggling antiques dealer (Peter Finch) thinks he has found the answer to his problems when he stumbles across a precious vase amid a range of other less desirable items. The trouble is, the owners of the vase are pretty shrewd themselves and are not keen on letting it go for a song - meaning that our hapless chap has to pull out every trick in the book in order to win his prize.