Gave this #7 some thought and unfortunately can not reach a definitive ID.
1. The writing is in Kanji, and taking into account wear, I think it says Shin Ten Kyu Yuu 新天旧友. A phrase I have never heard of and would translate to
"New world (heaven) old friend". But- The Kanji writing is written in the wrong direction. When something is written on the blade it is done vertically. See any Japanese cooking knife for an example. Also the writing of the Kanji is poor, as if it was written by someone not familiar with Kanji.
3. The blade has a dragon on one side and what I think is a lotus motif on the other. Neither of which one would find on a traditional Japanese knife, unless it was made for export to the West.
4. The overall appearanceof the knife follows traditional Japanese hunting knives in that it has a drop down guard. But instead of being a single guard/bolster it is separate, following a Western style. The swedge/clip is also a Western style.
My guess is that the knife was made in Japan in the 1950s up to very early 60s, as an export product with the Oriental motifs on the blade. This would before Seki started making very good knives. The Kanji was scratched in later by somebody outside of Japan.
I would put little to value on it other than as a historical piece.
Of course as there is no COO, it may have been made in Hong Kong or Taiwan.
That said, I have come across old Japanese knives that had bits of Buddhist scripture on them leaving me scratching my head. So one never knows for sure. Open to hearing any other opinions.