For those interested in genuine Marilyn Monroe signings, there are several in the upcoming Julien's Auction, which is taking bids online now, but the auction won't actually take place until 1st November.
Such as this, a quite long hand-written note, also signed.
and this note in her hand-writing, but not signed by her though.
Plus many more.
Is it your opinion that all of the Marilyn signed photos in the Julien's auction are authentic?
I'm not sure I have looked through everything on there yet, but post a link to whatever auctions you are interested in. I haven't seen anything not real to date, but Julien's does have a somewhat murky past to do with another famous figure, so caution is always best.