Update...
Hooked them up - they work perfectly and sound very good! The treble is crisp and clear which is a sound I don't usually get from old vintage loudspeakers, so I find this unusual and interesting at the same time.
I was unable to remove the back to see the woofers / crossover but, by shining a light through the front grill I could just make out that one of the woofers had a whizzer cone for the treble.
I tried to take the back off one of these speakers without success. I removed all the screws but the back simply would not pull off - perhaps over the years the wood has fused on somehow - I will try the other speaker later to see if I am luckier. But again, I find it odd somehow that old speakers like this have a very clear treble (via the whizzer cone).
The weight of these speakers may also indicated good quality. Basically I can't wait to prise them open and get more information when I can!!