Beveridge speakers-does anyone still use them?

I have one 80 year old friend with these.

Ebm he must be the original owner! Has he used them for the past 40 years? What version of the Bev's does he have?

I have just scored six (6) panels for the Beverage Two series speakers, but I am not sure if they are for the 2SW or the earlier Two model? What identifies them as to which model they are from -> Dimensions, wiring?
The neatly hand written (with red "Sharpie") info along the panel edge says => B1-10-06-87
Other edge writing shows:
B1-2.45 / 2.28 = 4.80 NF and B1-3.0 / 3.0 = 3.1 Kv

I might try shopping for any matching Beverage speakers that may need working panels to be restored, or sell them to someone who already has such speakers and just wants/needs the panels.

Once I learn more about them, and depending on difficulty of finding units in need of restoration, I might end up just selling them, so I need to learn how to properly determine what condition they are in presently. in order to come up with a current fair market price.

What things are ctitical for doing a proper visual inspection? Some of them have a few tiny circular (<1mm dia.) spots scattered about them where reflectivity of the shiny aluminum layer appears to be gone.
How many of these can pe present before performance is significantly compromised?

I will post some PICs shortly.

Baranyi,
You never answered Audiokenesis. What are you driving them with?

Roxy, the Beveridge 2 and 2SW's are self powered by their self contained OTL direct drive amplifiers. The speaker actually sits on top of the amplifier. The amplifier is the base of the speaker.