This is a Kyosukashi tsuba made in Yamashiro (Kyoto) during the Muromachi period. It features a crane circle design (Tsurumarugata) with openwork (Jisukashi) on an iron base. The rim is described as having slightly rounded square ears (Kakumimikoniku).

Kyo-sukashi School
Muromachi
Yamashiro
Hozon
Iron-tsuba · Yamashiro
Certifies a genuine fitting worth preserving: a correct signature, or, if unsigned, an identifiable era and school, with recognized artistic and craft value.
The NBTHK (Nihon Bijutsu Tōken Hozon Kyōkai, the Society for the Preservation of Japanese Art Swords) is a public-interest incorporated foundation founded in 1948 and supervised by Japan’s Agency for Cultural Affairs (Bunkachō); it is based at the Japanese Sword Museum in Tokyo. Its expert panels physically examine each submitted work (shinsa) and issue a certificate (kanteishō) ranking it by artistic and historical merit. NBTHK papers are the most widely recognized standard of authentication for Japanese swords and fittings.
NBTHK official siteReturns/exchanges/cancellations not accepted after shipment except for significant defects; if defective, return/exchange possible within 3 days of arrival (return shipping paid by customer).
This is a Kyosukashi tsuba made in Yamashiro (Kyoto) during the Muromachi period. It features a crane circle design (Tsurumarugata) with openwork (Jisukashi) on an iron base. The rim is described as having slightly rounded square ears (Kakumimikoniku).

Kyo-sukashi School
Muromachi
Yamashiro
Hozon
Iron-tsuba · Yamashiro
Certifies a genuine fitting worth preserving: a correct signature, or, if unsigned, an identifiable era and school, with recognized artistic and craft value.
The NBTHK (Nihon Bijutsu Tōken Hozon Kyōkai, the Society for the Preservation of Japanese Art Swords) is a public-interest incorporated foundation founded in 1948 and supervised by Japan’s Agency for Cultural Affairs (Bunkachō); it is based at the Japanese Sword Museum in Tokyo. Its expert panels physically examine each submitted work (shinsa) and issue a certificate (kanteishō) ranking it by artistic and historical merit. NBTHK papers are the most widely recognized standard of authentication for Japanese swords and fittings.
NBTHK official siteReturns/exchanges/cancellations not accepted after shipment except for significant defects; if defective, return/exchange possible within 3 days of arrival (return shipping paid by customer).