Hari Japanese Hand made Blade for Cutting & Cleaning Sides

Smith name: Unknown

Weight:  about 14g

Blade thickness: about 3mm

Total length: 63mm

Accessories：—

Additional Information:  Unused, in good condition. They were found in a professional tool shop in Saitama Prefecture, and the shop owner said they had been preserved for at least 10 years.

These blades are mainly installed on rabbet plane or some plow planes. Its function and usage tips are as follows(The thin knife mentioned in the quoted paragraph refers to this item): 

“This plane has an adjustable fence and a thin knife to cut and clean the side of a rabbet ahead of the blade.
As with all kiwa-kanna having knives, the knife's ura (flat part of the back) must be even with the side of the block; also, the tip of the knife should be slightly lower than the cutting edge of the blade, for a clean cut.” ——Toshio Odate 「 Japanese Woodworking Tools: Their Tradition, Spirit and Use」, p 103