Nagadai-ganna Japanese Smoothing Plane by Sakata Haruo - 65mm
Brand name: Ooda (太田)
Smith name: Sakata Haruo/坂田春雄(1912～ ？). Another famous plane blacksmith in the Miki area named Sakata Kenji/坂田憲治(? ～December 29, 2007) was his son.
Steel: Togohagane No.1
Jigane(Iron part of the blade): Modern soft iron
Blade Width: 65mm
Blade length: 112mm
Blade thickness: The blade near the bevel(about 5.60mm)，Top of Blade（about 9.80mm）
Blade Weight: 324g
Blade Angles: 24°
Chip Breaker Width: 54mm
Dai manufacture: Unknown
Dai size(length, width, thickness): 376mm 80mm 30mm
Total weight: 1174g
Manufacture Era: Before 1960
Accessories: -
Additional Information: This is a pre-owned plane sourced from a retired miyadaiku (temple carpenter) in the Kansai region.
The blade is an early work by blacksmith Sakata Haruo. While the front is stamped with a wholesaler’s brand, the reverse side of the iron bears Sakata’s own stamp ("坂田"). The stamp on the front, "高速度0号" (High Speed No. 0), indicates the blade steel; through my research, I confirmed this to be Tōgō Inukubi Reigō steel (東郷犬首零号鋼).
A similar blade was featured on this website, and I have translated their description of it below:
“A rare plane blade forged over 50 years ago using Tōgō Inukubi Rei-gō steel.
About a year ago, a former master carpenter brought in a well-worn blade of this exact model to have a wooden body (dai) made. When I test-planed with it, I was astonished by its sharpness.
It bites into the timber effortlessly, cuts light and thin, and holds its edge remarkably well without dulling—truly an exceptional plane.”
Website link:
http://katuhide.com/sakata.htm
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