Oh, it's definitely Riihimaki, and probably Okkolin
What I call the export vases are generally lighter, have flat bases (as opposed to moulded/ringed bases) and would probably have had the 'Made In Finland' rectangular label, rather than the Finncristall or the Riihimaen Lasi Oy labels.
The Stromboli would have the triangular label, and, more often than not, be etch-marked (with the Lynx mark) and numbered.
It may be that the lead content of the glass is lower, causing them to weigh less ?.. but I'm not really up on the manufacturing methods..
maybe somebody else can weigh in here ?