Vintage Hellsten Skruf Sweden Cylindrical THICK Heavy Vase Signed Mid Century

Unique glass vase, approx 7 1/4" tall, 2 1/4" wide at top, 3/8" wide rim, thick & heavy.  Weighs approx 2 pounds 4 ounces.  Signed on bottom I believe it says "Hellsten Skruf" and has some random numbers.  This was in my grandmas hutch that was passed down to me when she died many years ago.  Unfortunately I don't know anything about this piece.  Feel free to ask questions! Vintage Hellsten Skruf Sweden Cylindrical THICK Heavy Vase Signed Mid Century