A Japanese 4.5×6 folder, made by a company called Otowa Kōki (音羽光機).
There was a first model with folding optical finder, then the Middl 120-A with the finder contained in a top housing.
- Middl 120 with folding optical finder at a page of the AJCC, it is the folder pictured on the right
- Middl 120-A with sample pictures at je2luz
- Middl 120-A at Japan Family Camera