These are Dutch hallmarks, see Van Kempen & Zonen/Kempen & Begeer & Vos/Koninklijke Nederlandse Edelmetaalbedrijven/Nederlandse Fabrieken van Kempen en Begeer N.V Gerritsen & van Kempen n.v. Zeist.
The maker's mark; V above a crescent moon for; Zilverfabriek Voorschoten (Silver-factory Voorschoten), a subsidiary of Koninklijke Nederlandse Edelmetaal Bedrijven( Royal Dutch Precious Metals Companies). Mark used 1925/1961
Dutch lion passant with export key, 2nd standard silver fineness 835/1000, export key: mark to indicate 2/3 duty restitution upon export valid 1853 till 1953 .
Minerva head or office mark with the regional assay office letter C in its helmet for the assay office of The Hague.
Year letter T for 1929
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For Dutch hallmarks see
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Peter.
Source;
Waarborgholland, ˜Netherlands' Responsibility Marks since 1797