The other three types of coins have wider '貝' with similar styles of writing and the holes in the center are square shaped; therefore, they are categorized by the width of kaku (frame surrounding the hole of a coin), but some of them cannot be clearly categorized and are considered to have been made during the stage of transition from one type to another.
他の三種は「貝」が横広でほぼ字体も同一で郭はほぼ正方形であり、郭の幅により分類されているが中間的なものも存在し、制作上の移行期のものと考えられる。