Mei (signature) : Mumei(Unsigned)
Length 1 : 3.94 cm x 1.26 cm ( 1.55 inches x 0.50 inches)
Length 2 : 3.83cm x 1.38 cm ( 1.51 inches x 0.54 inches)
Jidai(era) : Edo Period
Special feature : Iris flower carved on Shakudo plate.
The Japanese reading for Iris is ‘Shobu’. Many Samurais liked iris design because the sound of Shobu also has a meaning for courage.
AOI estimation paper
In Kiri box.