As nobody yet to reply, I will fill in my thought here.
In case someone wish to contribute, this is the particular watch Ian is referring:
chopard.watchprosite.com
Ian, I prefer the specifics being engraved or printed.
Though from commercial side, it is easier to manage, as there are some numbers are preferred and not too due to various reasons.
For collectible perspective, you may wish to consider the Mille Miglia model issued for the Race with serial number engraved :
chopard.watchprosite.com
But the Rosso Corsa is more stunning...
Kong