ID this chalk line?

[bbbarracuda]

I picked this up last week and can’t find any info about it.
There are no markings that I can find. It seems really well built.
Any ideas of who made it, or where to look for more info?
Thanks

 

[The Cobbler]

nice old piece !

 

[dscheidt]

Makes it clear why it's called a chalk box.

 

[BrandonV]

Looks like a Japanese sumitsubo style chalk line with a karuko.