Hello, this item is a 4-foot-long Japanese-style sword, described as black with circular details on the handle, likely intended as a decorative or replica piece rather than an antique katana or functional nihonto.

From the images, the materials and construction (including the black wrap and ornamental symbols) suggest it is a modern-made display or martial arts training sword, commonly produced for collectors, martial arts practitioners, or as decorative home items. These pieces are typically mass-produced and are not forged or crafted by licensed Japanese swordsmiths, which limits their value compared to authentic nihonto.