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 Alien Avenger Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO Set 6975-1 Alien Avenger (1997 Space > UFO) | Rebrickable - Build with LEGO
Vintage Lego System UFO 6975 Instructions ( Manual Only ) | eBay