The OB stands for “Oriental Brewery”. Another fine beer I picked up shopping at the “International” grocery store near my house. Has a nice blue can:

Beer can

The small text there reads, and this is exact:

Timeless enduring heritage, craftsmanship and new rice addition delivers refreshing smoothness and clean after taste, making OB the most drinkable beer

The can notes that Oriental Brewery’s been in business since 1933, so timeless… ummmm…

Anyway, it tastes like other rice beers. I’d have trouble picking it out from Bud in a lineup.