For sale is an original antique cabinet card photograph. 
The hand looks strange but I can't guarantee that it is deformed. Usually photographers will highlight deformities like this by making their hands stick out.
It's possible the hand moved during the exposure causing it to look deformed.

Size: 4.25" x 6.5" - Decent Condition. No location. Normal minor signs of wear. Minor bowing. Likely from 1880s. See all photos for details.

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Thanks for Looking!