A märzen by the Ishikawa Brewing Co. of Fussa City (about as far west as you can go in the Tokyo suburbs, site of Yokota AFB). They go back to 1889, and have quite a checkered past. I also picked up some of their Pale Ale, Bottle Conditioned Ale and Münchener Dark. They have about six brews, counting a pilsener that I assume is about like most of the other pale yellow lagers I've had here. They also brew sake, which they have done right along. They had to quit brewing beer almost as soon as they started in 1889 because the crown cap hadn't been invented yet, and the temperatures just weren't cool enough for beermaking except in Winter.
They have quite the little facility in the Kumagawa neighborhood in Fussa, having not only their brewery, but a museum, nice little park, two restaurants, and the store where I bought the brew.