Westvleteren's dubbel can be recognized by its blue cap. Like the other Westvleteren beers, the bottle does not have a label, and the cap therefore has all the required information.
As the other Westvleteren beers, it can only legally be purchased at the monestary (on appointment) or in the bar across the street. However, it often finds its way on the grey market where it's sold at high prices. Show Less