I Have designed this new cassette for the Mamiya 16 range of cameras. It features the same snap on cap design used on my Minolta cassettes and I have tested it with great results in my Mamiya 16 Automatic. I cannot yet guarantee its compatibility with earlier Mamiya 16mm cameras but I have designed it to include the double spindle design used for the film counter in early cameras but retained the bridge joining the two halves for greater ease of use. I would very much appreciate feedback if you plan to use it on earlier cameras.