The pattern looks like Stuart Glendevon on a Waterford stem, i know from talking to the people in the Stuart shop Waterford carried on using Stuarts patterns, you may never be sure unless there signed, as for the second Greek key glass that looks 50's and that pattern or variation has been made for many years, i have a set of 1870's glasses somewhere with it on, it's the most common charity shop patterned glass.
A nice set of wine hocks usually sell between 40 and 60 quid for six, if you can find a signed glass and you know the pattern name they can fetch what ever someone is willing to pay if they have a broken glass and want a set, usually around £25 a glass.
Look in Ebay completed listing and it will give you an idea of what there worth, if you can i think it might be best to upload any future photo's here direct, i still keep finding links to pieces of glass i have no idea about on here from 2007, the photobucket ones are usually gone, i'm not sure how it works but i assume the images are stored for future reference, as a general rule no one likes to talk about values as they are all subjective and reflect the market value at a particular time, i love finding patterns so keep them coming, regards Chris.