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: Hi All,

: The Autavia Chronomatic has some unique differences to the later
: model after 1970.
: First obviously we have Chronomatic on top of the Heuer logo, the
: typo of AUTAVIA is unique, the dial color on the Siffert is a
: more colder white tone, the case has slightly smaler lughorns,
: the chronograph pushers are less embeded and stand out more
: prominent hence less protected or integrated than on the later
: versions.
: On my Siffert shown in my book on page 49 the back case is marked
: with a small C and numbers, which was done by the Swiss
: holesaler in 1969 and proofs that the watch was sold new in
: Switzerland.
: The hole case looks a fraction thinner than the 1970 version.
: On the Carrera Chronomatic the typeface of Carrera is different
: with a more pointed A, clearly visible on page 144.
: The early caliber 11 marks look slightly different C of CAL less
: rounded and A more pointed, further some small drillholes on the
: plate.
: Heuer produced between 200 and 1200 watches per modelline and year,
: production of the Chronomatic was started autumn 1969 and lasted
: around 6 month.Now we could start to guess ?

: Cheers

: Arno
: www.heuerchronographs.com