Kogai: Iron and silver.
Mei (signature) : Mumei(Unsigned)

Length : 1.1 cm or 0.43 inches × 20.9 cm or 8.22 inches
Jidai(era) :Late Edo period.
Special feature:Upper part of the Kogai was made by iron and later, silber plate.
As you know silver will be changed to black coloy if some one put poison in
his food. probably he was a very careful person.
This wari Kogai was used as chopstick.
I'm going to use this chop in the future for protecting death!
But i am not serious person. just joke.

AOI estimation paper
In Kiri box.