Thanks for the comments!
Just got some additional info:
The inscription on the tang says:
�TANIGUCHI� �YOSHIKANE SAKU� �SEKI� ... whatever it means.
Have just found that SEKI is the city in central Japan famous from swordmakers since XIII century up today.
Seki is called Solingen of East and there's annual Motoshige Sword and Cutlery Festival every October.

Also, received the kind comment from Andy "Militarynut":

"from the pictures its a excellant hand made blade especially when the pictures capture the two different harmon paterns one side shows the
harmon all most reaching the shoge line which is very unusual the outher side is lower this is kind of unusual and rare for a showa type blade
c 1925=1945"