Just google “rare akro agate glassware” and you will find that what ever piece is being sold is “rare” according to the sellers !! (just kidding) Do you have some that you need to check on ?? Best way to evaluate what people actually pay for the glassware is to look at ebay !! Not the list/asking/start price but completed sales that tell you what is actually paid !! You can look in books for value but that’s pretty much worthless if no one is willing to pay that amount !! The whole point of establishing a value is for purpose of re-sale !! So if you have an item that has a $100. book value but $50. is what you get on the secondary market,,you can safely say that’s what it is worth $50 bucks !! Sorry,,this may be more info than you wanted !!
Please post a pic if you have some AA and I will try to check for you !! Some of the colors are more valuable than others and some of the shapes/types are more in demand but its best to check each one instead of grouping all as rare !!