1. Do they function properly?
2. Is there something wrong with the drivers?
3. Rough, or smooth finish? Carbon fiber, (rough), graphite, or a poly (smooth).
Just so you know even the NOS is getting older now. The foams have a much shorter shelf life. The rubber style (depending on the composite material), can outlast the glue or binding agent. Silicone last a LONG LONG time.
There is a guy that bought a lot of the old factory surplus, close to the old factory site. Name is Pat. I can find his number somewhere.
I inquired about XOs and such, he had NO factory XOs
He had drivers and factory cabinets. Most of the stuff was older, but pretty well taken care of.
He post here in the VMPS speakers for sale, section.