Hello, I got your post while I was typing my reply, I know what you mean about the signature but it doesn't in any way resemble EAPG, the vase its gorgeous signature or not the clarity and brilliance are well, brilliant.
Also my friend picked me up a present, they still have the stickers on them they were made in Poland from a Danish design and they contain the "open bubble", which I read was a characteristic often used by Wirkkala in his designs.
Interesting fact I came across a while ago, Czechoslovakia produces the purest form of Silica there is.