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M. M. WARBURG & CO., HAMBURG 1' printed at bottom left; Addressed to Herrn Hugo Hartig.
Information Provided by Michael D. Bulmash:
The brothers Warburg, Moses and Gerson, founded the Warburg bank, one of the world's largest privately owned banks, in 1798. While the Warburg family still owns the bank, most members of the family had fled Nazi Germany to either the United States or to England by 1938.
4 3/4 x 6"
Warburg, Family, Bank
"M.M. Warburg and Company Envelope" (1930). Bulmash Family Holocaust Collection. 2016.1.08.