Same here.
I used quite a few Richard Allens in the 50s for other people. They were good and reliable. Some took a beating as PA loudspeakers. I also do not recall the type no, but remember the 12" types as quite low resonance (30 Hz or so). Spares was then available from Proctor in the Cape.
Only if they came from that time, I would closely inspect the cones etc. for age, eaten by bugs, etc.