Slow down Ric--it is a good example of a cobalt blue something.
Many folks, such as I, appreciate a good cobalt blue glass in anything.
I would pick it up for a buck or two--just because I like it.
It is more than likely a "Jabo Classic"--or a Jabo("Jaybo") made for general sales to the general public across the world.
I just love this stuff--collect what you like and stick to it regardless of any opinion---mine too.
Marble--On!!