Found my old UFO set: 6975 in the attic. Forgot how awesome this set was! It was purchased in Germany sometime around the year 1998 and is still in perfect condition : r/lego
LEGO 6975 LARGE UFO Instructions, Space
Vintage LEGO Alien Avenger 6975 Space UFO Incomplete See Pictures | eBay
NEW LEGO System UFO Alien Avenger 6975 Retired | eBay