Thank you very much for the info. I confirm that its size is 38mm which fits better on my wrist than the current 44mm. I have other chunky watches but I must admit that I am growing tired of them (as far as I am concerned the ideal size for a watch is between 38 and 40mm). What I also like is the thinness of this navigator case and the quality of the engraving on the back. It looks as if it was made by hand rather that with a laser (as it feels on the current steel models). I should think that the first navigator with display back ought to be earlier than 2008. I would like to know what differences there are between the two reference numbers. Cordially.