Current Cover Art Gear Geeking Question

[Uncle Dub]

Probably a long shot, but on this months cover is a stairway with the speakers on each stair, on the 4th step up is a speaker with a giant 3" magnet held in place by three large panhead screws (I'm guessing) and almost heart shaped cutouts in the stamped frame. Does anyone know the origin or manufacturer of said speaker?

I have one that was 'retrofitted' to an old Alamo tube amp I acquired, by means of cutting a giant hole in the backboard for the magnet to stick out. It's pure idle curiousity, I just wondered who created the monster. It seems more like an old style PA speaker than one you'd normally find on a little tube amp.

As ever, fascinating interviews and intriguing cover art. This month coupled with 'oh I got one of those syndrome '