Bizen tea bowl in shades of blue (Fujiwara Yū) - Shōwa 20th c.

Bizen ceramic tea bowl (macha bowl) in bluish hues.
Superb work by an artist close to Fujiwara Yū, a great name in modern Bizen, but the signature is difficult to identify.
Signed.
Showa 20th c.
Diam. 13.7 x 8cm
Sold in its wooden box.