The affixing of a seal to a record evidencing a contract for sale or an offer to buy or sell goods does not constitute the record a sealed instrument and the law with respect to sealed instruments does not apply to such a contract or offer.
Okla. Stat. tit. 12A, § 2-203
Oklahoma Code Comment
The distinction between sealed and unsealed instruments has been heretofore abolished in Oklahoma. 15 O.S. §139