Nihonbashi Tourist Information Center
The Nihonbashi Tourist Information Center, located at the base of Meibashi and Nihonbashi, sells a post office seal.
As you know, in Meibashi and Nihonbashi, the "Japan Road Signpost" is set up in the middle of the bridge, and the journey to Gokaido begins, and the distance to Nihonbashi is calculated.
For example, when you visit shrines and temples, you will have vermilion seal stamp written in the red seal book to commemorate your visit.
When you go to the Tokaido, Koshu Kaido, Nakasendo, Oshu and Nikko Highways, it will be a good memory if you have something to prove. Here, there is also a "post office seal book" that spells a fun memorial.
It will be a good memorial.
At the Nihonbashi Tourist Information Center, you can purchase "Tokaido starting point", "Oshu Kaido starting point" and "Koshu Kaido starting point" from Nihonbashi. It's 300 yen per sheet. Please buy it before and after your departure, and to commemorate the sightseeing of Nihonbashi, Chuo-ku.
Postscript: I have already obtained the postmark of Naito Shinjuku, the best post station in Koshu Kaido, at the Shinjuku Tourist Information Center.
From now on, I'm going to buy and have a fun trip at Shinagawa-juku and Senju-juku.