Okla. Stat. tit. 21, § 1841

No person, firm, association or corporation shall destroy, remove, alter, cover or deface the manufacturer's serial number from any tractor, combine, corn picker, corn sheller or hay baler, or any other piece of farm machinery having a retail value of more than Twenty-five Dollars ($25.00) upon which the manufacturer has placed a serial number; nor shall any person, firm, corporation or association, sell, offer for sale, or lease, or otherwise dispose of any such equipment on which the serial numbers have been destroyed, removed, altered, covered or defaced. Laws 1953, p. 96, § 1.