Campagnolo Record rear derailleur from 1967 to 1987.
One of the features is the type of patent-mentioning.

NOS vintage Campagnolo Valentino Super rear derailleur 

Vintage Campagnolo 1013/3 Sport derailleur
for lower end bikes late '50ies
 

  Altenburger Champion derailleur blue set from Germany.
Most known for its breaksets but here we have a rare blue derailleur set.

 Vintage Aigle rear derailleur and shifter
From Belgium 1930's
The rear derailleur is 'screwed' upon the wheel axle

 Vintage Sartel derailleur and shifter
From Belgium 1940's

 Vintage Huret Allvit derailleur and shifter 1e gen 1958 France

 

 Vintage Simplex rear derailleur

 Vintage  Super Champion Course 1936 from France.
Developed by Oscar Egg in the early 30'ies.
In Britain also called Osgear.

See article Oscar Egg frameset 50'ies