Both the manhole designs for Tamatsukuri feature magatama, the "comma" shaped jewels. This first design also includes an image of the Tamatsukuri Historical Park.
Located on the hillside right behind the Public Onsen, the park is the site of the biggest magatama production area so far discovered in Japan.
There is a modern structure protecting the archeological remains of the magatama workshop and a reconstruction of a yayoi period building.
Behind the park is a small museum with displays on magatama and their historical production.