[MR] ISO how to check age and authanticity of a medieval manuscript?

[Mary Bowles]

Greetings,
   
  I've got this manuscript problem. My mom's mother had a document that might of might not be 15th century german. How would I know if it is real? What type of test or visual keys might I look for. Or who might I take it to so it can find out?
   
  Thanks.
   
  Mary/Marie-Therese Normand

       
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