Okay. Three McIntyre clarinets. Three almost completely different cases.
All three may be original to our horns, but I have had Green and White cases in the past, quite like those you post and from the same overall time-period; one for a 1961(ish) Resonite Normandy and the other for a hard rubber 1957-1959 Boosey & Hawkes Edgeware.
At this point, I believe they sourced cases from whomever, and did not stick with one design, or even one manufacturer.
Thanks for sharing the pic.