The ${\overline{K}}^0-K^{-}$ mass difference has been measured to be 3.90±0.25 MeV. The method employed involves the observation of nine examples of the reaction $K^{-}+p\to {\overline{K}}^0+n$, ${\overline{K}}^0\to {\pi }^{+}+{\pi }^{-}$ in association with the proton recoil from the scattered neutron. The kinematic fitting of this event in the bubble chamber is very sensitive to the ${\overline{K}}^0-K^{-}$ mass difference. Sources of systematic errors are also discussed.

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