:Hi Giacomo

The ref V under the 1163 number would normally indicate that the case was from the Viceroy model. The version in your picture i believe is a Caliber 12 {although i have come across these dial versions with Caliber 11'S}. I might be wrong {jeff is better placed to answer this} but i believe either the dial or the case has been changed on your watch, so you have a Siffert Dial in a Viceroy Case.

The Autavia has so many case variants due to the success of the Viceroy promotion and the intensive production methods employed by Heuer to keep up with the demand...ie several different case makers, that its difficult to present a comprehensive guide, although you could check out the ref guide here. However your watch looks great and and the fact that the dial or case may have been changed will only matter to some people, so if your happy with it, i'd enjoy it.
Best Regards
Bryan

Hi,

: I have a Heuer Autavia Jo Siffert dial, later
: version, cal.12, glass plexi. Reference 1163
: with a V letter (under the reference),
: push-buttons are discoveries…

: Case is lighter than Autavia with mineral
: glass.

: Can this version exist?

: thanks