Pair of Quad ESL 57 Electrostatic Speakers - Serviced ?

I have owned these Quad Speakers for around 25 years and recently had them serviced by Quad at the IAG Service Centre at Huntingdon. Fantastic result, as they now sound really incredible. However, sadly, as I am now downsizing, I must sell them. The speakers are fitted with black grills which look amazing and really modern. (The highlights on the speaker grilles photos are caused by the lighting, not marks on the grilles.) As you can see from the photos, the appearance of the units is excellent, but as you might expect for items of this age there are some very minor marks. These obviously do not affect the performance and it is possible to refinish the units, although personally I believe it is better keep them original. The EHT blocks and treble units have been replaced to give top quality performance. This is a great opportunity to own and listen to these superb speakers.