I'm surprised its a Calibre 11- the hands and dial are from a second execution of this model, but I would expect that it was only the first model with steel hands would have the Calibre 11, with the rest having the Calibre 12.
Having said that, we were seeing Heuer use the Calibre 11 up to 1974 in small numbers (e.g. the Silverstone), so it's certainly possible.
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