Question:
I found 2 farm feeders in the basement of an old friend’s house. This first one is 10"high and 25" in circumference. It has 2 notches on either side for liquid to go through. It is in great condition. The printing on the front reads "RED WING, Poultry drinking fount and Buttermilk feeder". There are no other markings on it besides what you see on the front.

Answer: Sounds like you have the 1 gallon size Red Wing Buttermilk Chicken waterers. These waterers came in 4 sizes with the one gallon being the most common. They also came with a base. In mint condition without a base the value is around $50 to $75 depending on how well marked. Al Kohlman