Based on the postmarks and when these artists were performing at the Metropolitan Opera, these postcards were published sometime in the 1905-06 period. “… Nahan Franko was the particular star at the Metropolitan Opera House last night. The occasion was the last of the regular Sunday concerts, and, owing to the dispersal of the Grau Opera Company, the only members of the troupe available for the song numbers were Mme. Schumann-Heink and Miss Fritzi Scheff. Mr. Franko completed yesterday the twenty-fifth anniversary of his entry upon an active musical career, and, in recognition of this fact, the members of Mr. Grau’s company and the employees of the Metropolitan Opera House presented him with a silver salver and a check for a considerable sum.” Brooklyn Eagle; 10 Mar 1902.