Below is the used LEGO Castle #6075 set from 1981 that I had bought from a Craigslist seller in Tacoma.
I had to fill in quite a few yellow brick pieces of my own. I bought it knowing there were no knight or horse minifigures. (Aw). The red drawbridge is also missing its pulley and rope, used to draw it close.
Fun as it was, to build this set, it’s really outdated. The modern medieval sets from LEGO use gray bricks and not yellow, roof tiles, and add in a lot more detail to the castle walls and roofs, and to the minifigure characters (see the picture of ‘Kingdom’s Joust’).