This is not just rare it doesn't exist. I am the only one with them. I purchased the prototype samples directly from the original importer They are top quality, designed in Germany, made in England. The pictures tells the whole story. Fits a wide variety of Kodak cameras. I know it fits all the Pony cameras that allow for a flash to be mounted on the side. The Signet 30 and 40, Brownies, etc. If the camera has a spot for a flash to be mounted on the side of it like the camera in the picture which is a Signet 30, then this will fit. You will need to use a flash that has a sync cord, attach it to the post on the adapter and fire away. Great idea, great design, great item, and neat accessory for your vintage camera. It is made of sturdy plastic with metal screws and metal sync terminals.