Duke had a lot of figures in the vintage days. Some were great. Others were not. The 1993 Battle Corps figure, though, is more towards great. It's a strong mold with decent coloring and black accessories. There are rumors the mold would have been repainted in green cammo in 1995, but that figure never came to pass. Hasbro had the mold during the early 2000's, but chose to only revisit the 1992 Duke figure and ignored this mold. Here's some of the best content on the web for the figure.
1993 Duke Profile
1993 Duke at Nekoman's Viper Pit
Duke at JoeaDay.com
Custom Duke at OreoBuilder's Blog
Pre Production Duke at YoJoe.com
Custom Duke at Cooey's Toy Box
1993 Duke by BattleArmorDad1