Shakudō tsuba of the slightly vertically elongated round form (nagamaru-gata) decorated by gold in flat inlay (hira-zōgan) with three insects (cricket, locust, and praying mantis), grass and dewdrops motif. Kogai hitsu-ana is plugged with gilded soft metal. Height: 70.2 mm; width: 66.4 mm x Thickness at seppa-dai: 4.5 mm. Edo period (from ca. 1700 to ca. 1850) Unsigned. Attributed to Kaga School or Murakami School. Almost identical tsuba (no dewdrops, though) is illustrated and described at page 60 of Kokusai Tosogu Kai. 7th International Convention & Exhibition, November 1st, 2011 at Tokyo National Museum, page 60. It is attributed to the Kaga School, Mid Edo period (Late 17th - early 18th century). Dimensions: 70.5 x 66 x 4.5 mm. "The rich black shakudo plate has been slightly lowered (dished out) and then polished. Gold insects crawl amongst grasses, depicted by Kaga style hirazogan (flat inlay). One tendril of the mantis overlaps onto seppa-dai. The mantis boldly looks out from the tsuba in a curious way. This style of Kaga tsuba was popular during the Genroku era (1688-1703)."   Another source is Japanese Sword Fittings. A descriptive catalogue of the Collection of G.H. Naunton, Esq., completed and illustrated by Henri L. Joly, - 1912:

Kanazawa in Kaga was a centre of fine metal work during the whole of the Tokugawa period. At first the inlayers of Fushimi following the Daimyo Maeda went to Kanazawa, then some of the Gotō masters proceeded from Kyoto for short periods to work for the Daimyo, so that their influence was strongly impressed upon Kaga work..." A somewhat look-a-like tsuba is illustrated at plate XXVIII, Kaga Inlay, №653 with the following description at page 52: "Shakudō, inlaid with five insects in gold: crickets, praying mantis, grasshopper, in the style of Takagawara Ujitsugu.

According to M. Sesko, Ujitsugu was a master from Katsuki and Kaneko School in Kaga, son of Ujihira. Ujihira's father Ujiyoshi died in 1802. This brings us to the mid-19th century, instead of mid-18th or earlier. On the other hand, a very much look alike specimen at MFA collection (ACCESSION NUMBER 17.1061) has the with the following description: Edo period. Late 18th–early 19th century. Murakami School. Main material: shakudo; other metals: gold; decorative technique: iroe hirazogan. A detailed account of Murakami school can be found at The Japanese toso-kinko Schools.// Lulu Inc., 2012 by Markus Sesko, on pages 235-239. All-in-all, it's either Kaga School or Murakami School, either ca. 1700 or ca. 1850. Quite a range! SOLD