Mo. Rev. Stat. § 490.640
Current with changes from the 2023 Legislative Session
Comparison of a disputed writing with any writing proved to the satisfaction of the judge to be genuine shall be permitted to be made by witnesses, and such writings and the evidence of witnesses respecting the same may be submitted to the court and jury as evidence of the genuineness or otherwise of the writing in dispute.
§ 490.640, RSMo
RSMo 1939 § 1915