Gabriele D'Annunzio's signature.
[http://www.sothebys.com/en/auctions/ecatalogue/2012/toscanini-l12413/lot.22.html D'Annunzio, Gabriele

A COLLECTION OF SIX WORKS, ALL SIGNED BY D'ANNUNZIO, COMPRISING]; sothebys.com
Gabriele D'Annunzio