Help translating tang signature

Recently inherited a sword that my greatgrandfather acquired during his time in the pacific during WW2.

Trying to get a translation of the tang signature.

There is:

1) A small symbol with finer lines, sort of hard to see.
2) Three larger symbols.

Thank you in advance for any help.



The signature is "Mori Kaneharu". The smith is KAN822, who also signed "Mori Ryotaro Kaneharu".
The blade was made during WWII.
The smaller marking is called a "Seki stamp". It is similar to a military acceptance stamp. It typically means that the blade was not made in a completely traditional manner (some shortcuts were used because of the war).