This small cleaver is a traditional Japanese-style deba cleaver.  It has a stout blade with a single-bevel edge.  This particular size is used for butchering mackerel or other small fish.  3.0mm thick blade.

 

 

Knife Specs:

Knife Length: 210mm
Weight: 125g
Blade Length: 110mm
Blade Height: 40mm
Blade Thickness: 3 mm