No original document mentioning the X has been found so far, and the only known surviving example is pictured in an article by Yazawa. It has a wooden body, quite similar to that of the wooden Sweet but with folding struts on both sides. There is a focusing lever on the photographer's right, moving the bottom rails back and forth, and a crude distance scale inscribed LANDSCAPE, SKETCH and PORTRAIT. There is a rectangular logo attached to the left-hand side of the body, which is the same as found on the wooden Sweet, and is said to be typical of Sone. The bottom of the front standard has a nameplate inscribed TRADE X MARK. The shutter has O, T, I settings (respectively for Time, Bulb and Instant), the shutter plate reads "X" AUTOMATIC at the bottom and has the words MADE BY TOKYO CAMERA WORKS under the lens. (Tokyo Camera Works was the name of the manufacturing branch of Sone Shunsuidō in the 1920s.)
- Yazawa Seiichirō (矢沢征一郎). "Kamera 'X'" (カメラ"X", Camera "X"). Kamera Rebyū: Kurashikku Kamera Senka (カメラレビュー クラシックカメラ専科) / Camera Review: All about Historical Cameras no.11, March 1988. No ISBN number. Shirarezaru kamera (知られざるカメラ, special issue on unknown cameras). Pp.23–4.