Bottle - for the UK market.
Believed to be produced at Samlesbury but it’s not possible to be certain - unfortunately, AB InBev doesn’t seem to consider it important to provide consumers with full information on all their brands, or their provenance.

“A lightly carbonated lager brewed with a touch of sweetness for a smooth, easy taste at 4% abv, Bud ’66′ is a winning concept. Inspired by the lengths our brewmasters go to create the perfect beer, we named it Budweiser Brew No. 66 after the winning recipe number that had the perfect balance of ingredients creating the taste we know consumers will love.”

Budweiser Brew No. 66 is a 4% alcohol by volume lager that is brewed and distributed in the United Kingdom by InBev UK Limited. Launched in July 2010, Budweiser 66 is the newest member of the Budweiser family of beers with 84 calories in a 300 ml serving (just over 10 oz).