An article I was reading mentioned Creative Playthings, a vintage brand of toys “to provide simple and beautifully designed toys to promote a child’s creativity and imagination.” Reminds me a little of the modern brand Kid O. Anyway, a quick Etsy search turned up some beautiful (if pricey) stuff:
I also found an image of this structure, which is the exact one they had at my preschool(?) I think:
I can feel the texture of the wood slide surface in my hands. Crazy.