There are 14 very heavy screws securing the speaker cabinet’s back panel and it is quite the forearm twister to remove them all in one go. Quality of construction, indeed!
With the back panel removed, a very healthy looking 15 inch speaker is revealed. As can be seen, it takes up most of the cabinet space.
The speaker features a ceramic magnet with the words “Oliver Sound Custom Design” on the housing. No idea how Oliver date codes work but this looks like it could be from 1967. It handles the 35 watts from the amplifier in very smooth and toneful fashion.