Hi, :D
Meaning is:
Nagata Reijiro,a judo teacher made this for pleasure(amusement) in Takefu city (in Fukui prefecture)on March 15, 1964.
(To sum up, He(Nagata) made this sheath and recorded his name and date inside the sheath. )
Two kanji:
Although 久保 can be read as Hisayasu, it can read also as " Kubo " of a family name.