I recently bought a 1950's contemporary house from the original owner. He was a big music fan and left me what seems to be a JBL paragon speaker. I really don't know much about them, but noticed the one he left me has some differences to the models I have found online. I can't find any serial numbers but to be honest I am afraid of taking anything apart to look closer. He claims he bought it in 1957. Anyway, any help would be greatly appreciated.
I have attached some pictures. Not sure if there are any other areas I should take pictures of to help identify model.
Thanks in advance,
Gareth