Hi Phil
I agree with the others that you have an original and correct Autavia including the signature on the bridge and that you did very well on price. I can confirm that the serial number is also in the expected range. My example below is #263203 and is an Israeli Defence Force issued Autavia. The case has been polished where it should have the brushed starburst finish but this can be restored by a good case polisher such as Abel Court who is in Belgium. I don’t know who to recommend in the US. Maybe someone will add a name here should you wish to have the watch restored to the original finish. If it was mine I would.
What a good time to get an Autavia and enjoy.
regards
Paul
www.heuerworld.com