While the exact details are unknown, this is an old Okinawan sanshin neck. It is inscribed with "Tamaki ◯◯, May 1962." The neck weighs 423g. The wood is likely ebony, but this is uncertain (it could be either kuroki or ebony). There was a suggestion that it might be "kuroyushi," but this is unconfirmed. It is a well-made Makabe-style neck. The lacquer is old, and when exposed to a flash or light, it appears a reddish-brown color, typical of the time. The lacquer shows numerous scratches and signs of use. The neck has a slight twist, but it does not affect playability. Please make your judgment based on the images. Please understand that this is an antique instrument before participating. No claims and no returns. Thank you. https://ameblo.jp/34doumakiya/