We discuss the observability of flavor-changing transitions among heavy quarks in $e^{+}{e}^{-}$ collisions: anomalous thresholds $e^{+}{e}^{-}\to Q+{\overline{Q}}^{\prime }$, anomalous flavored-quarkonia formation $e^{+}{e}^{-}\to V\left(Q{\overline{Q}}^{\prime }\right)$, and anomalous decay modes of heavy quarkonia $\left(Q\overline{Q}\right)\to Q+{\overline{Q}}^{\prime }$, $Q+{\overline{Q}}^{\prime }+\gamma ,\dots$, etc. We express cross sections and partial widths in terms of a substructure scale and show what kind of limits can be obtained.

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