This Rolex ref. 3525 "Monoblocco" chronograph was delivered link to Royal Air Force Lieutenant Gerald Imeson while he was imprisoned and trying to escape from Stalag Luft III. It's a remarkable story of real-life resilience and intrigue, and the watch has an estimate of $200,000 to $400,000. You can read more about this exact watch in a 2013 HODINKEE article written by Eric Wind shortly before it sold for the very first time at Bourne End Auctions in Buckinghamshire, United Kingdom.