Paolo:

These are just estimates, but I would expect a 226xxx chronograph to have a Cal 11-I movement; it seems too early to be a Cal 12. I would expect 268xxx and 270xxx to be either Cal 11-I or Cal 12. By the time we get to 268xxx, there were plenty of Cal 12s being used, but it seems that there were also still a lot of Cal 11-Is being used. None of this is entirely precise, as we see the early watches that got the later replacement movements (Cal 12), and we also see some later watches that have the Cal 11-I movements (probably as Heuer used up its supplies, or when a watchmaker made the substitution, sometime later).

In terms of the arrows, I don't believe that there is any difference between the single arrow and the double arrows.

Jeff

+++++++++++++++++++++++++++++

: Just to re-open an old debate...

: I came across a couple of 1163 Viceroy, both with the ref. 1163V on
: the case:

: the first is an early one, 226xxx serial, powered with cal.12

: the second one is later, 270xxx serial. It was a surprise to me to
: see the cal. 11-I inside, and to discover that one lug is marked
: with the single arrow. I bought it from the first owner, that
: said me the watch has never had running problems so it has not
: been serviced for replacing the movement.
: I see on OTD pages another 1163V 268xxx, with cal. 11-I, but this
: has two arrows on the lug...

: Can someone help me about this mistery?

: Paolo