How many letters does the top answer for “one who determines authenticity (as of works of art) or who guarantees validity” have?

The most common answer is authenticator (13 letters).

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Crossword clue: one who determines authenticity (as of works of art) or who guarantees validity

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

authenticator 13 letters wn-def

one who determines authenticity (as of works of art) or who guarantees validity

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)