Hi, I got this several years ago. The signature is very light , faded, but I can see the indentation in the paper. I scanned this with Photoshop and made it darker, as is hard to see.
Not good. Observation #1 kills it. it's a copy/forgery/autopen done post "Some Like it Hot" that has elements of Marilyn's Pre-Some like it Hot signature. If it's an autopen/pre-print of some type, it wasn't an up to date signature, post that movie. By the time this movie was released, she was already penning those "Tazmanian Devil, whirlwind Ms of hers, among other features that developed through time.