Rare antique Singleton & Priestman 3 combination cutlery set - WW1?

Rare antique Singleton & Priestman 3 combination cutlery set - WW1? From research, it would seem as though this combination cutlery set dates to c1910, and I think that it may have been WW1 issue. It is very cleverly designed - it is 1 unit like a pocket knife, but if the knife, fork and spoon are opened to 90 degrees, the handles slide apart and the items can be used seperately. The combination set is made from quality razor steel, and is in very good condition - knife is sharp and items snap closed well. The set has a Patent No. 14520, and measures 9.5cm (closed) and 17.5cm (open).

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