Looking for information about Dahlquist CA-1W1

I recently purchased pair of Dahlquist CA-1W1 from original owner. They are in great condition and I'm very pleased with the sound. However, I'm trying to match a center channel, I looked up for some specifications over the web - nada. I'll appreciate any info on this model (e.g. Driver Complement; Design Principle; Frequency Response; Sensitivity; etc.)

Thanks