Hira-ganna Japanese Smoothing Plane by Usui Kengo - 72mm
Brand name: Tsurumichi (鶴道, The brand is presumed to belong to a wholesaler in the Yoita region)
Smith name: Usui Kengo (碓氷健吾, September 28, 1928 ~ March 26, 2012)
Steel: Blue steel (Based on my speculation)
Jigane(Iron part of the blade): Wrought iron(Kamaji)
Blade Width: 72mm
Blade length: 115mm
Blade thickness: The blade near the bevel(about 5.20mm)，Top of Blade（about 8.40mm）
Blade Weight: 337g
Blade Angles: 23°
Chip Breaker Width: 63mm
Dai manufacture: Unknown
Dai size(length, width, thickness): 275mm 90mm 36mm
Total weight: 1124g
Accessories: -
Year of production: before 1960
Additional Information: This is an unused plane. It originates from a retired miyadaiku (traditional temple carpenter) in the Tokyo area, being one of several planes he purchased in his youth and has carefully preserved ever since. The plane has been exceptionally well preserved by the miyadaiku; the blade is in pristine, like-new condition, and the dai (wooden body) exhibits no noticeable warping or twisting.
※ Basis for dating this plane to pre-1960:
The back of the blade is engraved with “ 通商産業局長賞受賞/Winner of the Director-General’s Award from the Bureau of International Trade and Industry.” According to records from the website, Mr. Usui Kengo received the ”Tokyo Bureau of International Trade and Industry Director-General’s Award' at the 2nd Nationwide Export Promotion Exhibition in August 1953 (Showa 28)“.
※ Seal of Authenticity: The back of this blade features Kengo Usui’s personal seal (a square stamp using archaic seal-script kanji).
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