Period: Edo period, Kyōhō era (1716–1736) Mounts: Shirasaya with inked sayagaki attribution  This is a fine Japanese katana mounted in a plain wooden shirasaya, bearing an inked sayagaki on the scabbard. The inscription attributes the sword to the Kyōhō era (1716–1736), citing the Minamoto lineage and the Hosoke family tradition. While unsigned (mumei), the attribution suggests a blade made in the Edo period revival schools under daimyo patronage.  The blade features a graceful shinogi-zukuri form with a well-proportioned curve (sori) and an extended ō-kissaki. A prominent bo-hi (groove) runs the length of the blade, terminating gracefully in the kissaki. The hamon is an active irregular (midare) pattern with hataraki visible, continuing into a turning boshi with return (kaeri) at the tip.  The nakago (tang) is ubu (unaltered), with one mekugiana, showing an even, natural patina consistent with its period. The blade shows areas of light scratches and surface wear, as well as minor oxidation near the habaki, but remains in solid condition with the hamon clearly visible.  Dimensions: • Nagasa (blade length): [please confirm exact measurement, appears katana length ~27–28”) • Motohaba (width at base): [to be measured] • Motokasane (thickness at base): [to be measured]  This katana represents a fine Edo period work, preserved with its historical sayagaki. A good example of an early 18th-century blade, attributed to the Minamoto lineage / Hosoke-den tradition