The kao written by Chojo in his early days is reminiscent of a bamboo leaf, and Keicho Oban with his seal mark are called Sasagaki (which literally means "bamboo leaf writing") Oban.
初期の長乗によるものは花押が笹の葉を髣髴させ笹書大判（ささがきおおばん）と呼ばれる。