Mei (signature) : Mumei(Unsigned)
Length 1 : 3.11 cm x 1.32 cm ( 1.22 inches x 0.52 inches)
Length 2 : 3.12 cm x 1.36 cm ( 1.23 inches x 0.54 inches)
Jidai(era) :Edo period.
Special feature: Kiri-mon, the paulownia crest known for Japanese loyal family and also government symbol are carved on Shakudo plates.
AOI estimation paper
In Kiri box.