A copy of the judicial record of a foreign country is also admissible in evidence, upon proof:
(1) That the copy offered has been compared by the witness with the original and is an exact transcript of the whole of it.
(2) That such original was in the custody of the clerk of the court, or other legal keeper of the same; and
(3) That the copy is duly attested by a seal which is proved to be the seal of the court where the record remains, if it be the record of a court, or if there be no such seal, or if it be not the record of a court, by the signature of the legal keeper of the original.