Can anyone identify these unusual omnidirectional 1970s speakers? Possibly Martin Persson?

[leponiemi]

Hi everyone,

I’m trying to identify a very unusual pair of Swedish omnidirectional loudspeakers from the 1970s, and I’m hoping someone here may recognize them.

The sound is remarkably good, with an exceptionally spacious soundstage, which immediately reminded me of the Carlsson philosophy. Several people have suggested they could be related to Martin Persson, but I haven’t found any documented model matching this exact design.

Does anyone recognize these speakers, know the model, or have any information about who made them?