Frank Miller ? Marv ? Specialty Piece

I have a friend here in New York named Luigi P. (his full name is in the preface of Krenkel Portfolio 1 for anyone interested). Through the years I have gotten many wonderful items from him including the Krenkel oil featured on this site, which he got from Krenkel. He used to attend cons religiously. Several years ago he was at a show where Frank Miller was a guest. Miller drew a few of his characters on a piece of comicboard, cut the pieces and gave them to anxious fans waiting at his table. Luigi was at the front and this is what Miller gave him. It is not signed. Through the years i've shown this to many dealers and the consensus is "looks like Miller, but it's not signed." Luigi gave it to me in writing that he witnessed Miller do this. Someday I hope to meet Frank Miller and hopefully he will authenticate it. If anyone can help me contact miller I would be grateful.. If anyone is interested in trading i would listen to offers. About 6 X 6. It's not signed.