Wharfedale SFB
Sand Fillet Baffle

Download Wharfedale 1956 review, 800k pdf

This is probably the most well preserved example I've seen.
No tweeter on this one - or it has been removed - mounting plate is there.
Pics from an eBay auction.

Looks like the high-pass filter has been used on the upper 10" driver?! Probably not a good idea.
Originally the 12" and 10" drivers were connected in parallel without any crossover.
Only the Super 3 tweeter had a series 2 uF capacitor for protection.