American sculptor (1898-1976) known as the originator of the mobile. ALS in French, signed “Sandy Calder,” one page, 8.25 x 10.75, postmarked May 17, 1971. Sent from his home studio at "Sache 37," an untranslated handwritten letter from Alexander Calder to the art critic Pierre Descargues. In fine condition. Accompanied by the original mailing envelope hand-addressed by Calder, who has added his surname to the reverse, "Calder, Sache 37."
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