How does he find these things? Etienne at Mid Mod Design in the Netherlands has this awesome-looking, de Stijl-inspired beech ply high chair c.1950 on hold right now. I hope he keeps the pictures online after it sells, though; the head-on and side views are things of beauty. And check out that adjustable footrest!
High kids chair influenced by De Stijl ca 1950, EUR200 on hold [midmod-design.com]