Yoroidoshi TantoSigned Tadayoshi (忠吉), Edo Period (17th–19th Century)OverviewDistinguished by its formidable geometry and refined martial presence, this antique Japanese yoroidoshi (armor-piercing tanto) exemplifies the pinnacle of classical swordsmithing. Bearing the esteemed signature Tadayoshi (忠吉) upon the tang, the piece is housed in a handsome inro-kizami saya (segment-grooved scabbard) and accompanied by dedicated storage mounts, presenting a rare convergence of severe functionality and samurai aesthetic refinement.The BladeHand-forgedtraditional water-quenchedfrom tamahagane, the blade exhibits the distinct, heavily reinforced cross-section characteristic of a premier yoroidoshideliberately engineered with an exceptionally thick spine (kasane) for penetrating armored targets at close quarters.
- Hamon (Temper Line): A brilliant, crystalline suguha (straight temper line) rich in activity and nie, retaining ample temper throughout and terminating in a well-defined, fully tempered kissaki (point).
- Jihada (Grain Structure): Tightly forged, superior grain visible beneath a high-quality traditional polish.
- Nagasa (Cutting Edge): 7 ¼ in (approx. 18.4 cm).
- Overall Blade Length (Tip to Tang): 11 in (approx. 27.9 cm).
- Nakago (Tang): Inscribed with the two-character signature Tadayoshi (忠吉); single mekugi-ana.
Mountings and KoshiraeThe blade rests in a finely executed set of koshirae designed to complement its compact, purposeful silhouette:
- Saya (Scabbard): Finished in a classic inro-kizami style featuring crisp, rhythmic segment-carved rings beneath a rich lacquer.
- Fittings: Fitted with matching menuki clusters and secured tightly by an authentic retaining peg (mekugi).
- Mounting Length: 11 ¾ in (approx. 29.8 cm) mounted with tsuka; 12 ¾ in (approx. 32.4 cm) overall sheathed in saya.
- Auxiliary Mounts: Accompanied by traditional shirasaya (plain resting scabbard) housing.
Condition & ProvenancePreserved in notable antique condition commensurate with age, retaining crisp geometric planes and an exceptional polish that fully displays the metallurgical activity along the cutting edge. Acquired from a private estate collection and offered in its authentic, as-found state.An exemplary gallery-grade acquisition suited for discerning connoisseurs of classical Japanese weaponry and samurai art.
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