At least it looks like different folks signed the pics even if they did use the same pen.

Related story: A couple of years ago we stopped in a store that sold items like you have listed but most of it was simply autographed pictures of famous folks. Though I have only achieved apprentice noticer status, it didn't take me long to realize that John Wayne and Marilyn Monroe had the exact same handwriting. I suppose if push came to legal shove, the place was selling autographed pictures even if they were all signed by the same person.