This hand was part of the below model. There is a photograph in the Henry Thode's 1913 book "Catalogue of Michelanglo's Models" on the Haehnel collection that shows the hand attached to the arm with no break. The break must have occured between 1913 and 1924 when the above photographs was taken of the hand attached to the arm.

Lower Right Arm with Bordering Back and Breast Part
Height: ?    Width ?

Drawing for Sistine Chapel showing arm ad shoulder