Iron tsuba of round form with design of wheel (kuruma) in openwork (sukashi). Squared rim. Copper sekigane. Yagyu school. Signed of the face: Fukui Tsuguzaemon. Early Edo period: Late 17th century (Kanbun/Enppo era). Height: 76.7 mm. Width: 76.8 mm. Rim thickness: 5.2 mm. Center thickness: 5.6 mm. Provenance: Sasano Masayuki Collection, № 203: "This design of spoke wheel relates to the 'circular principle' found in the Yagyu philosophy. Although it is very faint, Fukui Tsuguzaemon's signature is visible. Without a signature and based on appearance alone, it would undoubtable attributed to a later period".

Merrily Baird in her book "Symbols of Japan" [Merrily Baird. Symbols of Japan. Thematic motifs in art and design. Rizzoli international publications, Inc., 2001] provides the following explanation of the Wheel-of-the-Law symbol: "The Wheel-of-the-Law or Golden Wheel (rimbo, kinrin) has its origins in India, where it is known as chakra. [...] In Buddhist practice, it has been represented with eight spokes, reflecting the eight-fold path to overcoming worldly desire, and it signifies that all illusions will be crushed by the faith's enlightenment. [...] The Wheel-of-the-Law is an attribute of such deities as Senju Kannon, the Thousand-Armed Kannon, and Dainichi Nyorai, the all-illuminating solar figure who is the principal deity for Shingon Buddhism. From the Edo period on, the wheel also has been used in a secular manner", e.g. on family crests.