Thank you Babie Joe for you efforts.
As you mention some doubts regarding these kanji ans their meaning, I requested some help from meta AI which states:
Here’s what the inscription says, read top to bottom, right to left:
*次宗近正真模之*
*雞谷一閑人*
Translation
*_"Copied from a genuine work by Tsugumunechika.
Made by a leisurely person of Keikoku."__
Breakdown
- *次宗近* `Tsugu Munechika`: Refers to a swordsmith copying the style of *Munechika* 宗近. Munechika was a legendary Japanese swordsmith from Kyoto during the Heian period ∼10th century, part of the Sanjo school. "次" often means "the next" or "second generation".
- *正真模之* `seishin mo kore`: "Faithfully copied from a genuine/original"
- *雞谷一閑人* `Keikoku ikkanjin`: "A leisurely/idle person of Keikoku".
- *雞谷* Keikoku is likely a place name or studio name
- *一閑人* ikkanjin = a common self-effacing signature used by artisans meaning "a person with spare time"