$50 1929 Ch# 4862 First Ntl Bank & Trust Co. Oklahoma City, OK Low Serial # 74 PMG VF 25

Of the more than 12,000 banks that issued currency under this system, only 557 of them were Oklahoma National Banks, from Achille to Yukon. What's more, only about 4,000 Oklahoma National Bank Notes have been reported within currency circles. 

This $50 1929 example bears an impressively low two-digit serial # 74 and is housed in a problem-free holder.