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The Pronto is a long-lived series of leaf shutters made by the German company Gauthier based in Calmbach.

The Pronto appeared in 1912, the same year as the Vario, and both shutter models were modified in 1929 while the Pronto was synchronized in 1930.<REF> Shunkan o torae-tsuzukeru shattā-ten, p.

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