audio lab

HI I found these speakers at a weekend garage sale, but cannot find any information about them. There's no manufacturer's label or model number. I've included photos of the front and back. The foam "grills" are glued in place and so I was not able to see what type of drivers and tweeters hidden...

Any way to tell what model these are and if they are any good?

I have a pair of these but know nothing about them. Really like how they sound and wouldn't mind a third to use as a center channel. Anyone have experience with these? Regards, Ben