Jesus appeared to Saint Peter in 64 A.D.
The Apostle asked Him, “Whither goest Thou Master?”
Christ answered, “I am going to Rome to be crucified again.”
Saint Peter returned to Rome where he was crucified.
Being placed on a cross, he asked not to be crucified in the same manner of his Lord Jesus Christ, for he was not worthy to die the same way.
The creator of your artifact made a point to depict two ways St. Peter could have been hung,
different than how Christ died. Today most paintings only show St. Peter being crucified upside down,
but long ago objects of devotion were created from an artist’s point of view.