Seal unnecessary on bonds, deeds and contracts.

Mich. Comp. Laws § 600.1401, under REVISED JUDICATURE ACT OF 1961.

Mich. Comp. Laws § 600.1401

Sec. 1401. No bond, deed of conveyance or other contract heretofore or hereafter executed in writing, signed by any party, his agent or attorney, is invalid for want of a seal or scroll annexed thereto by such party.