 The fourth revision was the "Blue Stripe" Mark III which featured a blue marker stripe above the power cord.The lead channel was voiced so brightly, it is considered to be the most aggressive Mark Series Boogie ever introduced.The presence cap and voltage rating of some of the orange drops in the power section were also altered to mirror that of the IIC+

The final revision was the "Green Stripe" Mark III, which was only available in a Simul-Class format.