My BIL had one set. I didn't look "under the hood", but he said the machine was missing and that everything there was missing. Someone gave it to him. (The wheel moved in response to "treadling" it.)He said he thought he might put his grandmother's sewing machine in it. I've not seen his grandmother's machine, but I understand it's in one of those wooden round top Singer cases. As I understand it, the machine is in storage.
The other set was in an estate sale. The top was close to rotted out, but the irons were not rusted. They moved in response to "treadling" it.
Neither set of irons had a name on it.
bkay