Aikuchi refers to a tanto mounting that omits the tsuba entirely, resulting in a seamless fit between the handle collar (habaki and fuchi) and the saya's mouth. Historically associated with formal court wear and certain civilian carrying traditions during the Edo period, the aikuchi style prioritizes elegance and clean lines over the decorative emphasis of a full tsuba fitting. For collectors, an aikuchi tanto presents a visually minimalist profile that highlights the quality of the rayskin wrap and saya finish rather than ornamental metalwork. It is a distinct and historically grounded mounting choice, not simply a simplified version of standard koshirae.