Tsuda Tōtōmi Nagamitsu, National Treasure tachi sword at Tokugawa Art Museum, Japan
The Tsuda Tōtōmi Nagamitsu is a national treasure sword housed at the Tokugawa Art Museum in Nagoya. The blade measures roughly 72 centimeters long and displays carefully inscribed marks on its steel surface that demonstrate skilled metalworking.
The sword was created in the 13th century during the Kamakura period, when military production intensified to counter Mongol invasions. This era shaped weapons development that would define regional reputation.
The blade carries the mark of the Osafune School from Bizen Province, where master smiths refined their craft techniques. The way it was made shows how much skill and dedication were valued during this era.
The sword is on display at the Tokugawa Art Museum in Nagoya, which is open to visitors on regular days. Plan enough time to examine the fine details of the blade in its quiet setting.
The master smith behind this work created around 150 known blades with his own signature. These marks remain his most important identifier and help experts recognize his creations.
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