Firstly - yes, the colour is quite RiihimĂ¤en Lasi and not that rare after all. It is from the later era of blown vases. That is, from the 70's I believe.
Anyway, it could not be from 1982 as RiihimĂ¤en Lasi ended producing blown glass in November 1976. Also Mr. Okkolin only worked for RL until 1974 when he retired and after that until 1977 free lancing.
As there are known errors in some foreign books and as I cannot find any other facts (in Finland) of the possible designer of this vase I would not recommend spreading this further as a known Okkolin design. My opinion so far is it might belong to the export collection that was marketed without mentioning any designers.
Of course you may see similarities to known Okkolin vases (Stromboli, Chimney) and you could even say it probably is his design.
By the way, the size, RL vases usually were either 16, 18, 22, 28 or 20, 25, 30cm so I would guess yours might be of the 25cm size.