Yep as Paolo notes below - and i mentioned in my post - the script looks more like the Autavia MH 1163 Cmatic, which in turn looks totally different to the script on the Siffert 1163T Cmatic.

: I agree that the script type is very similar BUT when compared in
: macro photo's from Paul's A & F Chronomatic Carrera
: http://www.onthedash.com/Guide/_Chronographs/63.Carrera/e.Automatic_Early/b.Ref_1153/a.1153N_Chronomatic/32Car1153NChronomaticPG.jpg
: there does seem to be some differences.
: Immediate differences i notice are :-
: - the R in Chronomatic has a longer loop on Paul's
: - both the N & M on Paul's are considerably wider
: - much shorter horizontal line on the T on this new Silver
: discovery
: - both of the C's seem too closed on this new example , with too
: exaggerated serifs
: - the HEUER symbol is a lot wider on Paul's version
: - By far the most off putting fact however must be the fact that
: the 2 registers are white where we would all expect them to be
: black

: If you look at the word CARRERA compared to Paul's then there are
: infact many more similarities.
: I cant say i'm convinced either way on this dial just yet but would
: like to spend a lot more time looking at comparison photo's with
: known Carrera Chronmatic examples.
: Interesting dial either way.
: Cheers - Darren