An image of a speaker that is driving me nuts...

[jstorz]

Ran across this speaker image, I know I've seen it somewhere, just cannot remember. I'd appreciate the memory jog, can't get any info from the publisher

 

[kach22i]

Not a clue.

From Italy?

DIY?

Tang Band makes some copper dust cap drivers.

EDIT:
Doing a search I found this interesting open baffle design

https://www.pinterest.com/markusgrelka/amazing-loudspeaker/

Search term: "diy tang band speakers elliptical"

Not real close, but I tried.