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The largest independent, non-commercial, consumer-oriented resource on the Internet for owners, collectors and enthusiasts of fine wristwatches. Online since 1998. | |||||||
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Vintage Heuer Discussion Forum
The place for discussing 1930-1985 Heuer wristwatches, chronographs and dash-mounted timepieces. Online since May 2003. | ||||||
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As Jeff said, the C-number was put on by/for Cuanillon, Heuer's distributor in Switzerland at the time.
As for the watch only having a serial marked and not a reference, this is how the watches were marked for most of the 60s, with the reference only being added to later watches. I have a Carrera Dato 45 with a serial pretty close to this Autavia (880xx) and it doesn't have a reference marked either. So nothing to worry about.
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