Comment by frnz

Very impressive. I also like this LECTRON-system by Gregor Greger from 1965. BRAUN bought the rights and then Dieter Rahms worked on the design in 1967. Produced until 2022 (!)

You can still find some stuff on ebay with "baukasten braun lectron"

edit, Link to Wikipedia: https://de.wikipedia.org/wiki/Lectron