We discuss an orbifold of the toroidally compactified heterotic string which gives a global reduction of the dimension of the moduli space while preserving the supersymmetry. This construction yields the moduli space of the first of a series of reduced rank theories with maximal supersymmetry discovered recently by Chaudhuri, Hockney, and Lykken. Such moduli spaces contain nonsimply laced enhanced symmetry points in any spacetime dimension {ital D}{lt}10. Precisely in {ital D}=4 the set of allowed gauge groups is invariant under electric-magnetic duality, providing further evidence for the {ital S} duality of the {ital D}=4 heterotic string. {copyright} 1995 The American Physical Society.