A signed baseball is autographed, or hand signedby a noted personality. A stamped baseball is a facsimile signature, stamped or printed on the baseball. It is a copy of the actual signature of the noted personality. It is called a stamped signature, because a stamp is made of the signature to be used in the printing process.
Facsimile or Stamped signatures are printed signatures usually used on Souvenir baseballs, promotional photos, Postcards, Bats, Gloves, advertising's etc. A preprint, or Facsimile is simply a photographic copy of an original signed photograph, or in the case of a Baseball a stamp is used to mass produce the signature.
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A signed baseball, and an autographed baseball is basically the same thing just a different use of terminology. Autograph is more commonly used referring to when a celebrity signs an item but it means the same as sign or signature. Just as you might call a car an automobile. It's the same thing.