Lessor's signature
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
Any Indian who cannot write his name will be required to sign all official papers by making a distinct thumbprint which shall be designated as “right” or “left” thumbmark. Such signatures must be witnessed by two persons, one of whom must be a U.S. Government employee (such as field clerk, postmaster, U.S. Commissioner, etc.).
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.