Bonhams has released details of its April sale of antiquities [April 29, 2009: catalogue]. There seems to be a curious lack of history for some of the pieces. Take lot 17: An Attic red-figure bell krater, "Attributed to the Painter of Montesarchio T.121, circa 4th Century B.C."
The krater originally surfaced at Sotheby's London, May 31st, 1990, lot 376. The entry then tells us that it was "On loan to the Borchardt Library, La Trobe University, Melbourne, Australia, March 1995 - April 2008." (For a list of other significant pieces displayed at this location.)
However there is no mention that the piece was once owned by Graham Geddes and that it had been left unsold in the Bonhams sale of 15 October 2008, lot 8 [see earlier comment on this sale].
The krater had an original estimate of £10,000 - £15,000. Yet five months later the estimate stands at £5,000 - £7,000.
The key issue for this krater is the identity of the person(s) who consigned it to the Sotheby's sale in 1990.