Mass. Gen. Laws ch. 41, § 18B: Facsimile signatures of city clerk or assistant city clerk

Section 18B. A facsimile of the signature of a city clerk or of a duly appointed assistant city clerk, imprinted by either of them upon any original instrument in attestation of the fact that the said instrument has been recorded in the city clerk's office, shall have the same validity as the written signature of either of them.