An East Greek Bronze Warrior from the Medici Dossier

Cambridge University researcher Christos Tsirogiannis has reminded me of some of the images from the Medici Dossier that have been published in Greece. One shows a series of small bronzes lined up on shelving, some with sale tags attached. The image includes a small bronze of a running warrior. It is clear that one of the legs has been damaged.

This bronze appears to be close to the one due to be auctioned at Christie's Rockefeller Centre on June 6, 2013 (lot 543). The collecting history is:

• Thétis Foundation, Geneva, acquired prior to 1987; sold at Sotheby's, London, 23 May 1991, lot 77.

So what was the full collecting history of the bronze prior its acquisition by the Thétis Foundation?