I have the speakers I grew up with in the 50's 60's.

i can not seem to open the picture from italian ebay

That's because it ended in 2014.

Cheers George 

makes sense, thanks

The 375 is a large compression driver that is normally attached to a horn.  They were the largest such driver made by JBL in the time period you are writing about.  They are highly sought after  are sought after.  They were used in a number of Iconic period speakers like the Hartsfield and the Paragon.  There should also be a woofer extended range driver present, unless they were removed etc. 

they have never been opened  and are in tact as they went from mothers house to mine.There is  one area where the veneer has peeled off but that is cosmetic on only one. . My husband was offered $ for the horns but refused to open them       He was once involved with Erath speakers, a small houston based business in the late 70's.  .

I do not see a value in the bluebook- guess I am not looking hard enough