This is because there is no historical document to support this, even though several old natsumes that are said to have been made by Goro HANEDA can be found in the Fujita Museum of Art and others.
藤田美術館他に羽田五郎作の伝来を持つ古様の棗が数点現存しているものの、史料による裏付を持たないためである。