I was contacted by a gentleman in Georgia who has what he believes is
the cabinet for the center channel speaker for this setup.  It had two
eight inch drivers facing forward in a very similar type cabinet. 
Looks like this was early stereo stuff (late 50s - the woofers have a
mark that seems to indicate 1959 manuf. date).  I wish I knew more. 
Still trying to contact Philips. The speakers really are very nice.
 
Sean