Tagged WW2 Japanese Dagger

[Utopianarian]

Hello, I was hoping somebody on the board might assist with identifying this one. My brother sent me pics of this dagger my grandfather brought back from the Pacific after the war. Not traditional obviously and is a fixed blade. Here are the pics of the tag that was attached to leather scabbard and a pic of what appears to be an arsenal stamp in the leather scabbard. Any assistance of what it may be or translating the tag or arsenal stamp. Thank you

[BANGBANGSAN]

全 (All)

兄 (Brother)  

仝=同（Together/Equal)

楠ケ浦門    Natsuigahara Mon

通勤車 Commuter vehicle

橫廠(橫須賀工廠) Yokosuka Factory

[Bruce Pennington]

Quite an unusual item, George.  I remember reading on various threads of guys, back then, carrying their own small weapons.  I've also come across other guys (I think on Warrelics) with gate pass tags.

[Utopianarian]

Thank you for assistance Trystan and Bruce