The EAR 509 pair are still quite desirable and from the look of them they are probably a Mk 1. EAR themselves are able to service and repair anything they have ever built and their costs are very reasonable.
As to price it depends on working properly or not and physical condition and a far better set of pictures would be necessary including removing the cages. Pity about lockdown as any prospective buyer should examine and listen.
Your location would help........I am sure other Wammers will give opinions to help