Lovely watches to all 3 of you.
The first thing i noticed when you placed your photo up Paul was that yours had fluted pushers. I have no idea over whether the round or fluted pushers are the correct specification but i would point towards the 2446C Autavia's that came out at the same period. There seems to be a clear model change where suddenly we see the change from round to fluted style pushers - in the case of the 2446C GMT Autavia's its where the seconds chrono hand changes colour from white to red.
Do we know what year(s) the 7863 were for sale?
Cheers - Darren
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-: Mine is 138803 and has fluted pushers.
: regards
: Paul
: www.heuerworld.com