The data are based on the publicity of Japan Post.
[Note on the Stamp]
The stamp depicts a part of "Daikei-shiyu-zu," which is one of the thirty paintings entitled "Doushokusaie" in possession of Imperial Household Agency. There are micro-letters read "JAPAN POST 2005" and "metallic multi-image" on the background. Each micro-letter measures 0.3 mm across.