Well, that's good information to have! My money's on French if it's between French and Bohemian. It's a stunning piece, and quite unusual.
Jane Spillman is really helpful. She's the curator of American glass at CMOG, but she seems to answer every question that goes to Corning, regardless of the glass origin.
Probably the most exciting day of my life glass-wise was one on which I attended a meeting of the NE chapter of the American Cut Glass Assoc. that was hosted by Jane Spillman. I was there as a guest of a member, and planned a whole road trip around the event. Before going to her house there was a lecture at CMOG by an engraver, and afterwards we all went out to dinner.
Many folks on this board are used to hobnobbing with famous glass authors, if they aren't authors themselves. I hadn't ever even talked in person to another glass enthusiast before this trip. I also was VERY fortunate to be allowed to visit the house of a couple who have written many glass books but who are somewhat reclusive. I had been a fan of theirs since my earliest glass days, so it was a real treat. And they took me out to dinner!
Sorry, that's all a big off-topic aside. Your note just reminded me of the trip.