WOW!!!! In 1932 Jimmy Claxton also played for the Nebraska Indians...It is quite possible he is wearing that uniform...it almost appears as if the symbol could be a Native American symbol.
Here is a 1932 flyer from the NI...they have a similar round symbol in the same place on the uniform, but the symbol can not be made out on the flyer. I also realize that the uniform is dark in your photo and light in mine, but the NI team was well funded and could have had different uniforms.
