Tataki-Nomi Japanese Made Timber Chisel By Ichihiro Ⅱ - 48mm

Smith name: Yamazaki Isamu (1912 ～1987)

Steel: White Steel No.1

Blade width: 48mm

Blade thickness: Blade Bottom(about 12.80mm)，The blade near the bevel (about 8.40mm)

Manufacture Era: Before 1963

Weight: 358g

Blade Angles: 25°

Total length: 245mm

Neck length:  70mm

Blade length: 50mm

Wooden handles：Japanese White Oak（Shirakashi）

Accessories：—

Additional Information: Although this chisel was used extensively by its previous owner, it still has a vast amount of service life remaining. I did a repair sharpening, bevel to 1000 grit, ura to 1000 grit. This is an Tataki chisel from the era of the second-generation Ichihiro. 

Based on the feedback from the steel and the condition of the burr while sharpening the chisel, the steel is quite hard—harder than the steel found in Kiyotada chisels. That said, the heat treatment is excellent, with a uniform microstructure and good toughness. However, since the toughness is slightly lower than most Kiyotada chisels, you might need to increase the bevel angle when working with hardwoods.

I also verified with Mr. Tsuchida that Kiyotada chisels generally use White Steel No. 2 (Shirogami #2), while Ichihiro primarily uses White Steel No. 1 (Shirogami #1). Speaking strictly of the steel itself—excluding the influence of the blacksmith's technique—White Paper No. 1 is harder, while White Paper No. 2 possesses greater toughness.