From YouTube:

This is an old Tv Spot for Murphy’s Irish Stout. This commercial/advert was taped from channel 4, (England), around 1998/1999 on VHS PAL…. Sorry for the quality loss in the transfer, was best I could do with the old tape.

according to the imdb this was made by Mamoru Oshii, maker of the Patlabor and Ghost in the Shell movies, allegedly(Imdb often wrong!). This was known as the Murphy’s Irish Stout “Last Orders” spot or the Samurai and beer spot!

Made by Production I.G.
their info listing is as follows:

Air Date: October 1997
Format: 1 x 60″
Agency: Nexus Productions
Director: Hiroyuki Kitakubo
Character Design/Animation Director: Kazuchika Kise
Layout: Atsushi Takeuchi
Art Director: Hiromasa Ogura
Animation Production: Production I.G

Here’s another one in the style of a Japanese Samurai Film

From YouTube:

Made by the creative advertising agency Bartle Bogle Hegarty, written by Hugh Todd, art direction by Adam Scholes. Aired on Irish television around the mid 1990’s. This was just one of several made in the same style for Murphy’s as part of the same campaign at that time. The others, if my memory serves me correctly, were much shorter.