vortex screens

I am thinking about selling a pair of vortex screen speakers . these were pre Von Schweikert Audio days made by albert . I want to get an idea what these speakers would be worth. THANKS
I had a pair, nice, gave them to my friend
less than the VR4's
I would think around $800-1000

best sell is to audition them

nice disappearing speaker, big footprint, tweeter a little on the shrill side