This is sourced from July 2006 at the latest, and from the web link listed here, you can see something of an interesting lineage. Link rot is a bitch though so a lot of things have been lost because of an entrance page.
https://web.archive.org/web/20040626075919/http://yaneura.client.jp/
Not sure whether the artist is named "Yaneura Kuuzokudan" on account of the website, or if they are some "Ryokura." Our existing Yaneuras are not sourced from a similar era, and nor do they have a similar style.