Kozuka:
Mei (signature) :Mumei(unsigned) Kogoto.

Length : 9.59 cm or 3.77 inches × 1.43 cm or 0.56 inches
Jidai(era) :Late Muromachi to early Edo period.
Special feature:The attrition of the syakudo nanako plate, it looks old Kozuka.
On the syakudo nanako plate, a Japanese ship is drifting on the water.
This is elegant and peacefut atmosphere which is nice condition and
fantastic subject.

AOI estimation paper
In nice Kiri box.