Okinawa Sanshin - Kubaharu Tono-gata - Neck Only - Probably Ebony

This is a slightly slender Okinawan sanshin棹 (neck) in the Kuba Harudono style.
This listing is for the棹 (neck) only, as shown in the photos.

It matches the characteristics of the Kuba Harudono style, except that there is no step in the core, no pigeon-breast design, and the thin, flat top means there is no triangular hole in the core (only a mark is drawn).

Based on its appearance and feel when held, it is likely ebony.
Apologies if this is incorrect.
The weight is approximately 650g.
The maker is unknown as there is no inscription.

This is a used item, so returns will not be accepted except for damage upon arrival. Thank you for your understanding.