6075-2: The first LEGO castle, which was released in 1981. I picked this up for $50 last week and built it today. Only missing four pieces and half of a minifig. Such
6075 Wolfpack Tower
1981 Lego Yellow Castle 375/6075 with Box
Lego 6075 - instruction of alt. model C building - YouTube
LEGO 6075-1 Wolfpack Tower Set Parts Inventory and Instructions - LEGO Reference Guide