This is the LIGHT LENS LAB 35mm Optical Viewfinder L-VF35 / SBLOO Reproduction Black. It is a new item from Kouten Koubou, priced at 38,700 yen (tax included). I purchased it in May 2025, but I haven't used it much. As you can see in the photos, I think it's in good condition, but since it's a used item, please purchase it only if you understand this. The following is from the Kouten Koubou website: The LIGHT LENS LAB 35mm Optical Viewfinder "L-VF35" is an external viewfinder suitable for the LIGHT LENS LAB M 35mm f/2. It is a reproduction of the Leica viewfinder "SBLOO" and is used by attaching it to the accessory shoe on the top of the camera. Compared to the camera body's viewfinder, it allows for framing with a clearer view. A bright frame indicating the 35mm focal length shooting range is also displayed inside the viewfinder. The exterior has a unified feel due to the solid brass construction, and the front glass is coated to prevent scratches. Specifications Model Number: L-VF35 (B) Lens Configuration: 2 groups, 4 elements Magnification: Approximately 0.77x Material: Brass Size: Approximately W32 × D38 × H26.5mm Weight: 46g