http://www.ebay.fr/itm/Breitling-Naviti ... Swv9hW4Ss01/ the caseback looks original but the SN 9030884 is unregistered and does not sound as originally stamped
2/ the blank crown is described as original ... ok for an Aviation version but not for a Breitling 7806
3/ the Valjoux 7740 shows all correct Breitling markings
4/ ok Breitling issued a gold plated version of the 7806, rarely seen
5/ wrong small second hand but it is a minor detail
Assumed that some of the early Aviation had kept the Breitling marked Valjoux 7740 unchanged , I suspect here a Aviation 6087 retrofitted in Navi 7806 configuration by swapping caseback and dial ? But maybe I am paranoid ?