It's true, with hyacinth glasses we do not really look at the art of glass but at the unusualness of the product. As they have been around since 1740 there is a lot out there with a lot of well known factories and designers involved. We collect with that in mind, but as it was a household item research is very difficult and a lot of very interesting glasses a mistery to us. Therefor to date our glasses we have to pick the brains of glass experts and yes, we are willing to pay for something rare, rare for us that is, may be not from a glass point of view. Patricia