Presenting Darth Vader from the Star Wars Vintage Edition Toyline.Take note that this is Darth Vader, or Darth Vader's armor as it appeared in Star Wars Episode IV - A New Hope.
To the uninitiated, the Darth Vader armor used in Episode IV is different from the armor used in Episodes V (Star Wars Empire Strikes Back) and VI (Star Wars Return of the Jedi); and is VERY different from the armor used in Episode III (Star Wars Revenge of the Sith).
When Episode IV was made George Lucas was not 100% sure of the origin of Darth Vader - much like he didn't know that later on Luke and Leia would be twins - so when George decided that Darth Vader was a cyborg, he needed to emphasize this a little more in Darth Vader's armor for when it would appear in Episode V.
