Oconomowoc, Wisconsin. $20 1929 Ty. 1 Fr. 1802-1. The Oconomowoc NB. Charter #13616. PMG Choice Uncirculated 64 EPQ. Serial Number 1.Oconomowoc is located in Waukesha County, the name was derived from the Potawatomi term for "waterfall". The town had just two issuing banks, the First National and this bank which issued only small size. While this newly discovered serial number 1 makes 17 notes known, they consistently trade for over $800 in grades very fine and better as it is one of the most popular locations and town names in Wisconsin. A $10 number 1 from the E position is known but has never been offered for public sale. This example is the absolute finest for either of the two issuing banks.