I didn't think that you were doubting my reply, Ed
I too am really curious
I actually have about 70 Riihimaen pieces, some signed, some not, some labelled, some not, some extrememly thick glass and some really quite delicate.
I know that David555 (Adam P) was doing a little research into the thickness of certain Riihimaen vases, but he hasn't been around for ages.
Della