Those hollow-hands are actually mock-ups of the luminous, radium-filled hands that were common in the 1940's, so normally not 'skeleton' per say (they were always meant to be filled with luminous). There is nothing very modern in them, appart from the incongruous fact that those hands are meant to have luminous in them and that it was a poor design decision to apply them to a non-luminous dial (see for reference, how the pocket chrono has plain leaf hands)