Hi, you could try looking under E O Brody Glass, USA. I've seen some of their pieces with the 5/6 sided shape, but tbh, I don't recall seeing that colour range. I've even gone as far as to look at the Chinese rage, but nothing at present. I wonder if the correct name for your vase is hobnail too? From your picture the base edge looks worn, probably a 60's vase at a guess

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