I started reading William Gibson's Mona Lisa Overdrive this evening. A couple of pages in he mentions "the shadow of the Hattori clock". Must be a pretty big clock, so I look it up. Turns out to be a rather famous landmark in Ginza. Kintarō Hattori started his watch and clock business (otherwise known as Seiko) in Ginza in 1881. Ginza is a district in Tokyo, Japan. In 1932 he built the K. Hattori building.
Tokyo PX in the K. Hattori Building
Much of Tokyo was devastated by American bomber raids during WW2, but the Hattori Clock Tower survived. After the war it became the PX (Post Exchange) for American G.I.'s. In 1947 the building went back to being a department store.
The Wako Building Today
At some point people started calling this the Wako building, which is the name of the department store that occupies it.