A pair of strabismus diagnostic and exercise cards in black and white. The card to the left, 44, has the image of 2 men playing maracas, with a bird flying very close over the man with a tall hat on the left; the card to the right, 44a, has the image of 2 men playing maracas with two birds flying in the distance close to the two top corners. 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