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Heuer Autavia 73663 "Predial"

Hi,

sadly didn't win the auction (I have a spare Siffert color 73663 Dial) but I was wondering if anybody had any leads on what this exactly is?
Don't think it's a prototype because the 201765 serial number is rather high in the 73663 series?

https://www.ebay.com/itm/Mens-Wristwatch-Ihose-Heuer-Leonidas-SA-SWISS-absolutely-rare-stopuhrfunktion-/312927398244?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%3AIT&nma=true&si=%252Fr9O0HA9HigclxhEK%252FOO1KgEFHA%253D&orig_cvip=true&nordt=true&rt=nc

Cheers
Erik

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