One who appears to be a principal, whether by the terms of a written instrument, or otherwise, may show that he is in fact a surety, except as against persons who have acted on the faith of his apparent character of principal.
Okla. Stat. tit. 15, § 372
Apparent principal may show himself surety
R.L.1910, § 1051.
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.