Usually this sort of trademark lettering is custom work, not a font. It is a simplification of Old English, I would say, designed to make the lettering easier to read, and to look more modern than the original Blackletter type.

- Mike Yanega

I agree with Mike. Lots of Belgian beer logos are handlettered. Check out these fabulous examples (not all beer) by Brody Neuenschwander, an American born calligrapher living and working in Belgium.