Antiquities, With a Proven Record, Drive Auction Market – an interesting article on the state of the antiquities market and why provenance and dates of ownership are so important. The 1970 Unesco Convention has helped to slow down the trade in stolen artifacts and more museums and collectors are now shying away from works that lack an early provenance. Works that have appeared on the market before 1970 bring exceptional prices and the others are having a very difficult time.