That's a new one for me - thank you. I see from other posts you've been on a bit of a Borgonovo roll!
I can only find one link and it's for two blue ones that do not appear to have the prunts. However, they are the same shape and hammered effect. Unfortunately the website is Korean, so I cannot find out anything else. I don't imagine these are a rare item, so it surprises me that I can't find anymore.