Hamilton Chrono-Matic Count-Down on eBay

There is an unusual Hamilton from the sixties for sale on eBay.It is the Chrono-Matic Count-Down World Time. The dimension of the case is generous: 48mm excluding crown & pushers. The one for sale on eBay seems to be in excellent condition. Link to the auction: http://rover.ebay.com/rover/1/724-53478-19255-0/1?ff3=4&pub=5575561976&toolid=10001&campid=5338641195&customid=&mpre=https%3A%2F%2Fwww.ebay.it%2Fitm%2FHamilton-RARE-Vintage-COUNT-DOWN-GMT-CHRONO-MATIC-141001-3-48mm-World-Time-GMT%2F163788014294