A pair of strabismus diagnostic and exercise cards in black and white. The card to the left, 47, has the image of a cresent moon with a sad face and one large star in front of it and a smaller star above to the right; the card to the right, 47a, shows image of a cresent moon with a sad face and one large star in front of it and another smaller star under it. Stereoskopische Bilder für schielende Kinder.
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Related Title(s):
Hidden treasure and Is part of: Stereoskopische Bilder für schielende Kinder.; See related catalog record: 52331180R