Complete 50S structural kit.  All instuction, catalouges and paper work.  Used and well played with, but in very good condition.
 
fischertechnik was created by Artur Fischer in the late 1960's.  Per Wikipedia --" Fans often refer to Fischertechnik as "FT" or "ft". It is used in education for teaching about simple machines, as well as motorization and mechanisms."