Not sure if this is the place for this information, but I thought it could be helpful to those trying to decipher the model they may have imported.
Will need a translator, but it is good for the pictures even without.
https://mr-bike.jp/mb/archives/3786
Some limited production examples
(https://mr-bike.jp/mb/wp-content/uploads/2019/10/q2-15/06.jpg)
(https://mr-bike.jp/mb/wp-content/uploads/2019/10/q2-15/11.jpg)
(https://mr-bike.jp/mb/wp-content/uploads/2019/10/q2-15/14.jpg)
(https://mr-bike.jp/mb/wp-content/uploads/2019/10/q2-15/19.jpg)