It's vintage i.e. from a time before they revived Gant Rugger a few years ago.
Since it doesn't appear in this thread that I can see, Gant have finally opened up a us web store.http://us.gant.com/
I bought and received it today. it is an authentic gant rugger from spring 2006 collection. It's a saleman's sample. The fit is perfect and i'm very happy with the shirt.
I think that the link you posted is only about present collection and are not shown previous years' ones.