Got this a while ago, French c1920 maybe? Just a guess. There are other shapes with the same decoration as though painted to a template (but have lost the link).
Don’t think it’s anything special but the frosting is interesting, it looks like an applied fired on finish (rather than acid etching or abrasive matting). Almost like a very fine overshot technique.
I think it might be similar to the base of Davenport frosting which sounds like it was an applied glass paste. See here:
https://www.glassmessages.com/index.php/topic,70876.msg394467.html#msg394467On my vase, you can see that the frosting was painted on with the rings going around the circumference of the vase. The surface texture can not be scraped away with a scalpel. I don’t know if this was a widely used technique or if it’s useful for dating or to hint at origin.