1964 was the most productive year for the Zatoichi movies, with four productions in the same year ! « Zatoichi and the Chest of Gold » is the sixth film of the series, and there is a comeback of the brother of the main actor Shintaro Katsu, Tomisaburo Wakayama.
My effect "Children are wonderful" is mentioned in the video above; it is described in my book Your mind is still my playground, available HERE.
Zatoichi 2 - The tale continues
Zatoichi 22 - The one-armed swordman