I am assuming that the 7863 cases / pushers / bezels / etc. had the same evolution as we saw on the 2446C cases, as discussed here --

http://www.onthedash.com/thoughts/2446c-and-2446c-gmt/

Would be interesting to see whether serial numbers can help us establish the transition in the various elements, but it probably gets very complicated.

Jeff

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

: Ron - we see all the compression cased watches with a variety of
: parts - pushers, hands, dials etc and most prevelant on the GMT.
: I think it goes without saying that smooth/round pushers were
: standard on the early examples but who would ever know when they
: switched to fluted pushers but I they did at some point. Then
: there is the service issue and plenty examples must have gone
: back to Heuer at some point in their life when they may have had
: some parts changed as is common practice even today. My
: conclusive opinion is that its inconclusive.
: regards
: Paul
: www.heuerworld.com