I agree, watch is not Nos but polished.
The 'soleil' finish of the case is made with a disc of too little diameter, so the satin finish does not look straight but circular.
I think the movement is not same era of the Chronomatic but slightly late. (Note how HEUER is written on the bridge and other particulars)

Very rare and interesting anyway...

P

: Dear all,
: I also got pictures of the here offered Chronomatic Siffert
: Autavia.

: As far as I can see this watch was rebuild from a normal Siffert
: offered recently. So only the dial was exchanged. also the box
: does not belong to this model (but was sold with the other
: watch). Case is refurbished and ploished (as with the other
: watch). Even the bezel insert looks the same....

: Any comments to this? I think at this high (expected) price level
: we should discuss the quality very well.

: rgds
: APE