After digging through a box of gifted LEGO for hours and only one piece of the instruction booklet left, I finally completed this. 6894 Blacktron Invader : r/lego
Amazon.com: LEGO Blacktron Spaceship (40580) : Toys & Games
LEGO Space Classic Blacktron 6894 Invader Original Vintage MISB!! | eBay
6894 Invader - Brickipedia, the LEGO Wiki
Lego 6894, Hobbies & Toys, Toys & Games on Carousell
ヤフオク! - ☆LEGO#6894 Invader 中古☆
Space Theme Sets - LEGO 6894 Invader Original Vintage Blacktron Space Ship Set
LEGO Space: Invader (6894) for sale online | eBay
Invader - LEGO set #6894-1 (Building Sets > Space > Blacktron I)
Review: LEGO 40580 Blacktron Cruiser (GWP) - Jay's Brick Blog