The TimeZone "prototype" has genuine Autavia hands, whereas the ebay "prototype" has the Elgin hands.

For the record -- Until 2003, Heuer never made an Autavia that did not have a rotating (outer) bezel. This was a defining aspect of the Autavia, going back to the introduction in 1933. One must seriously question whether Heuer would have even experimented with prototypes that did not have this feature.

My guess -- these "prototypes" were put together from a modern-day parts bin.

Jeff