These are a Japan built woofer version of the famous RCA LC1a, complete with the 7 bumps. I bought and shipped these from Japan, and they can ship to you in the same bombproof origami packaging.
Images on google drive:
https://photos.app.goo.gl/gTirq5cgAhdvgGd3A
More items available here: https://www.diyaudio.com/forums/swap-meet/355749-honesty-cleaning.html