Model 44

The Heavy Duty Armor (Model 47), was an armor that appeared in the Iron Man Comics of the Marvel Comics Universe, that was published and created by Marvel Comics.

The Secret Origin of Tony Stark
The Heavy Duty Armor was used by Tony in locating the fourth of all five Extremis Kits stolen and sold.

Trivia

 * The original color scheme for the armor was supposedly red and yellow until it was changed by the writers to black and gold instead.