Can anyone help identify these speakers?

I've had no luck finding info on these speakers, so thought I'd ask here.
The approximate dimensions are: 20 x 8.5 x 8 inches.
Yes, the shape is a pentagon. Each cabinet weighs @ 17#.
The LF drivers are @ 6" diameter.

I've posted a few pictures below:
Name Plate/Logo
Front
Rear

Thanks for any help,
Dabney