Looks like Cheltenham Light to me. A bit squooshed may be...

Thank you very much for your Reply :)
The ITC Cheltenham looks really really close but i have a doubt...

Agree. Some details look a bit off like top serifs angle, weight, x-height... The Herald Tribune could easily use a (slightly) custom(ized) version of Chaltenham...

If the International Herald Tribune _g_ looks anything like the one shown in this sample

I assure you that it is some version of Cheltenham.
Don

Yes it is surely a custom Cheltenham, the _g_ is very similar but with these little differences.
Thank you so much for this help, i'll let you know if i find the answer of this question ;)
jC

I've found it i think, it seems to be the NYT Cheltenham customed by Carter & Cone : http://fontsinuse.com/typefaces/7802/nyt-cheltenham