If you look at Enicar and other three register chronos you will see that they have a seconds chrono hand with a square near the end . And if you look at the Heuer catalogues and ads from the period they are "needles" .Like I said "nice watch" , "great restoration" and it would be an easy fix .

: Are you sure that this one isn't the original
: one? The watchmaker didn't question the
: correctness of the seconds hand, and it
: looks to be correct as far as style goes.