Moser?

I have a question about this "coffee decanter " that I found at a sale today. While looking it up online, I see some that are listed as Moser that are very expensive. I also see others that are around 100 bucks. How do I tell if mine is an authentic Moser and worth the huge prices? The picture of the bottom shows the marks where it was mouth blown. I have my fingers crossed that is a treasure.!