Your search for "Naniwa whetstone" revealed the following:

ibuki tanzo blank blade forged blue #1 steel Kurouchi Tosa Chef knife 165mm

$64.65 ~~$86.20~~

This is an especially sharp and high class hardness Japanese knife blade, using core blade blue-1 steel from Yasuki hagane,...

$88.35 ~~$93.00~~

This is an especially sharp and high class hardness Japanese knife blade, using core blade blue-1 steel from Yasuki hagane,...

$145.00

Naniwa is one of the most famous Japanese whetstone brand developed new whetstone. It's a very compact, easy to use size. available to use...