Examples of the type

Picture 1 of the example of 2 Mun (Tong; lunar station) Picture 1 of the example of 2 Mun (Tong; lunar station)
© amakitu_Japan (CC BY-NC)
Private collection
ND (1742-1752) 統 – (en) concave star(concave dot) at Rev right
30.7 mm • 5.54 g
CK# 라-402-3宿➁
降寶爪マ頭通背右陰星
30.6mm～30.7mm
Thickness;0.8mm～1.1mm