Envelope front addressed to Mina Kaufmann, posted from New York

This envelope was addressed to Mina Kaufmann at her apartment at 145 West 86th Street, Apt. 7D, New York City. Despite the New York postmark of February 6, 1940, the return address on the reverse (0010) identifies the sender as Arthur Baer of Rotterdam, Netherlands. The letter was likely forwarded or re-mailed within New York after arriving from Europe. The machine cancel promoting U.S. Savings Bonds was a standard postal slogan of the period. Arthur Baer's involvement from Rotterdam connects to the broader network of European contacts assisting with the Oppenheimer emigration — Rotterdam was a major port of departure for transatlantic crossings, and Baer may have been involved in arranging the Oppenheimers' transit through the Netherlands.