4 kanji on the blade, hard for me to understand

[Mark]

i have a katana, the tang is mumei but there are 4 kanji in the blade. I think i see ??  Tada ?? Kuni  but can't make sense of it. I appreciate the help

 

mark

[SteveM]

盡忠報国  Jinchū Hōkoku

Its a patriotic phrase, commonly seen on WW2 items (particularly flags). "Loyalty to Country".

[Mark]

Steve

 

thanks! I Appreciate it. makes sense now.