Hey Stewart, fantastic watch and pictures as well. Thanks also for the extra shots at the link.
I happen to own both the day and the day-date versions and love both of them: the former was my first proper Heuer and has been the one I've worn most ever since. Rugged, reliable, sporty yet classy on its own - I love to wear it whenever I am on black shoes, either casual or with a suit.
A winner, wear it in good health!
Cheers,
Fabrizio

PS I don't think the white hand in the hour subdial is correct, though this was in Heuer's last days when anything might have happened: we have seen white hand on this and orange hand in the 510.511 Carrera, when it should have been the other way round...