Hi David,
you'd done it in the right way.....thanks for this.
your speakers seem to be from late 1964 to 1965. i am sure that we can tell you more if we know the driver numbers.
The registry shows some white "year" spots in this area.
pls send me your em adress to my PM, so I can send you the sheets for this.
HP
PS: can you try to find out from this gentlemen when he bought them?