LEGO Space Classic Blacktron 6894 Invader Original Vintage MISB!! | eBay
LEGO 6894 Invader Instructions, Space
LEGO 6894 Invader Set Parts Inventory and Instructions - LEGO Reference Guide
Vintage 1987 LEGO Blacktron Invader reviewed -- The original set 6894! - YouTube
6894: Invader - Back of the Box Builds
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