[Pettigrew pointed] at Black, and Harry saw that he used his middle finger, because his index was missing. (PoA 269 UK paperback)
He stretched his right hand out in front of him -- the hand with the missing finger. He gripped the dagger very tightly in his left hand, and swung it upwards. (GoF 556 UK paperback)
Our best evidence is that Peter is left-handed (in addition to the self-mutilation all being done left-handed, he grabs and uses Lupin's wand with his left hand), so not only is he giving Voldemort the hand that's already mutilated, he's not even giving up his dominant hand.
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Date: 2004-06-15 03:40 pm (UTC)He stretched his right hand out in front of him -- the hand with the missing finger. He gripped the dagger very tightly in his left hand, and swung it upwards. (GoF 556 UK paperback)
Our best evidence is that Peter is left-handed (in addition to the self-mutilation all being done left-handed, he grabs and uses Lupin's wand with his left hand), so not only is he giving Voldemort the hand that's already mutilated, he's not even giving up his dominant hand.