This topic might have a better name.
First Doctor's hand
Talk about it here.
This hand was one that the First Doctor was born with. (AUDIO: The Beginning, PROSE: Frayed, COMIC: Time & Time Again, TV: The Name of the Doctor, Listen)
He nearly regenerated after surgery by Aldridge to replace it after it was cut off and stolen by Soul Pirates. (PROSE: A Big Hand for the Doctor)