The ebay speakers are G12Hs and are slightly earlier (pre-rola) type with the 'Celestion' logo rather than the 'Rola-Celestion' logo.
If the cones are original and there is no rubbing on the voice coils I'd say the speakers are worth £300-400
Try playing with a spankin' clean tone on the neck pickup - there should be no 'grating' sounds on the speaker and the bass end should be punchy and true.
Have a look at the back of the cones through the holes in the frame and let me know what the lettering is on the cones. You'll most likely see 003 or 3 but might also get 1777 - these are all lead cones and shows that the speakers have not been reconed.
Why do you want to sell them btw?
:twisted: