I don't know how much they are worth. But, I do know that if you click on the following image search, that you might find items that could be similar to the ones that you have.
crystal decanters value - Google Image Search And, there's also the following searches to try.
crystal decanters value - Google Search crystal decanters value ebay - Google Search
It seems hard to find your specific items and information about the maker on the web. It may still be out there, though. I would also check with a library that has books on the subject of glass and china collectibles, maybe even a bookstore that sells used and out-of-print books on various subjects.
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