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Awesome find from Arroyo Grande CA. The reason I know this is pre WWII is because glass that was in constant reach of the sun turned purple / lavender / lilac over time. The chemical that was used in glass was needed during the second world war, and was no longer used for your average glass....this particular item started off clear, and over time turned purple. Good way to estimate age of glass if you it wasn't left primarily indoors....don't think I'll find any more pieces like this outside of the 10 or so I have....magnificent and hypnotic, looks like some kind of orb from outer space!