The Heuer Autavia 3646 is powered by the manually wound Valjoux 92.
The movement on nearly all pieces features stamping on the chronograph bridge.
On one arm:
ED. HEUER
& CO
and on the other:
SWISS
and train wheel bridge stamped:
UNADJUSTED
SEVENTEEN 17
JEWELS
’92’ is stamped at the edge of the movement, with the Valjoux symbol (“R”) immediately above.
I have not seen any import codes on the movements I have seen, although total pieces with movements shown is a relatively small sample size.
