I thought they were OSS but evidently not.

Robbins of Dudley Trench Push Dagger
Maker: WWII British Fighting Knives

This British manufactured Robbins of Dudley Trench Push Dagger and the other edged weapons they made were for private sale to troops heading in harm’s way. The dagger has an aluminum alloy hilt with a steel knucklebow and a 5 inch blade. The appropriate Robbins of Dudley sheath accompanies the knife. References Flook, British and Commonwealth Military Knives p. 24, plates 32 & 33, Silvey, Knives WWII p.136

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