New spectroscopic results for high-spin states in Os-192 populated in deep-inelastic reactions include the identification of a 2-ns, 12(+) isomeric state at 2865 key and a 295-ns, 20(+) state at 4580 keV and their associated Delta J = 2 sequences. The structures are interpreted as manifestations of maximal rotation alignment within the neutron i(13/2) and proton h(11/2) shells at oblate deformation. Rotational band members based on the long-lived, K-pi =10(-) isomer are also identified for the first time. Configuration-constrained, potential-energy-surface calculations predict that other prolate multi-quasiparticle high-K states should exist at low energy. (c) 2013 Elsevier B.V. All rights reserved.