Hey Ron, I hope everything is great with you. I think you remember this marble correctly. There are no seams to speak of. The construction is similar to many Alleys, and although the colors do look pretty Vitro in the right light, the base is more creamy than the Vitros I've seen and the blue seems more powder blue than typical Aquamarines. Also, the striping does not look like ox - more of a brown/red and, overall, the glass is not as filamentous as the aquamarines I've seen either.
But ultimately, whether it's an Alley or an odd Vitro, it's a really nice marble. And more importantly, I'm sure we'll have great fun discussing the possibilities when we meet again. For me, that's the best part of this hobby.
If I ever do get a "positive" ID, it'll wind up on the shelf, just like a book I've already read - great for reference and nice to revisit occasionally, but lacking the excitement and expectation associated with finding and reading the next great one.