How many letters does the top answer for “form by stamping, punching, or printing” have?

The most common answer is mint (4 letters).

Crossword clue: form by stamping, punching, or printing

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

mint 4 letters wn-def

a plant where money is coined by authority of the government