This came from a mad scientists horde and was probably part of a project camera. The front fits Horseman / Sinar but the back is a wooden frame that appears to be home made (nicely done though) and has opening of about 8.25" x 10.25".
8x10 bag bellows are expensive so it could be worth converting this for another application.
There are two small patches on the bellows; otherwise they are sound and light-tight.
SKU: 240916-13