Or. Rev. Stat. § 78.2050
An unauthorized signature placed on a security certificate before or in the course of issue is ineffective, but the signature is effective in favor of a purchaser for value of the certificated security if the purchaser is without notice of the lack of authority and the signing has been done by:
[1961 c.726 §78.2050; 1985 c.676 §78.2050; 1995 c.328 §21]