They are good pieces...the clear one had a shade from the 60's but told the seller to throw it as it was aged badly. They tend to go for good prices here in OZ, $70 plus but I have noticed elsewhere, like Europe and the U.S they go cheap. It is definitely hard trying to match them up for a pair especially as I want labels on them, so even harder!
The shade on my piece was round and cylindrical and would have been white (yellow with age).
I am trying to collect most of the colours for research and reference. It will take some time though. I do love these, common but extremely beautiful!