This is a 1-sun 2-bu Kanetake flat chisel. Although there is no maker's mark, I was told it is from Kanetake, a specialty store for chisels and carving knives. Takahashi Kazumi Special Chisel Manufacturing, which made Kanetake, seems to have closed down, so I think it will become difficult to obtain these in the future. Since there is no maker's mark, I will offer it at a slightly lower price than the market value. Please feel free to comment if you have any questions.