Puzzle - Shakespeare Portrait with Pinholes

Front:
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Back:
Author and Composer Series. Published by Alfred Holzman, Chicago Ill. No. 15. (31 Card. Posterte. Carte Postale. Germany. 18. Auber 4. Ibsen 15. Shakespeare 16. Gounod 17. Napoleon 18. Weber 19. Schumann 20. Schubert 21. Haydn 22. Strauß 23. Verdi 24. Rubinstein ...