Okla. Stat. tit. 84, § 84-103: Effect of alteration or partial erasure

A revocation by obliteration on the face of the will may be

partial or total, and is complete if the material part is so

obliterated as to show an intention to revoke; but where, in order

to effect a new disposition the testator attempts to revoke a

provision of the will by altering or obliterating it on the face

thereof, such revocation is not valid unless the new disposition is

legally effected. R.L. 1910, Sec. 8360.