Mailing envelope addressed in type to Walter Knasmuller in Germany, 9 x 6.5, notated on the front in Einstein’s hand, “First Class!,” and filled out on the flap with his return address, “112 Mercer St., Princeton, N. J.” A few tears from opening and expected creases and soiling, otherwise fine condition. Accompanied by a softcover book in German. Pre-certified PSA/DNA.
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