hard to tell from the tiny image, but the bridge is from a much earlier watch...probably the entire movement is not original.
Not correct for any 2446 reference.

: Dear Heuer guru's,

: My Autavia 2446C went to my watchmaker for a full service.
: He is in the business for a long time, and is servicing high-end
: quality watches.

: Now he showed me that my Autavia is equipped with a Valjoux 72
: movement of
: exceptional quality that he had never seen before;

: 18 jewels
: movement signed Ed Heuer & Co , Switzerland, with Heuer logo
: stamped in it
: Serial number 452991
: Compressor cage

: All 2446C's in my Heuer bible have 17 jewels movements.

: Could you please share your thoughts with me about this movement ?

: Thanks &
: Happy new year !

: Jan Willem Franken
: The Netherlands