What does the hallmark P.N.S on the base of christening cups mean?

The hallmark "P.N.S" on the base of christening cups typically stands for "Peter Neale & Sons," a well-known British silversmith company. This mark indicates the manufacturer of the cup, which is often made of sterling silver and used in religious ceremonies. Collectors and enthusiasts often look for such marks to verify authenticity and craftsmanship.