That 1911 Spalding photo is very interesting. I looked at the
1910 and
1911 rosters for the Adrian Yeggs, but found no Siebert. I found
Harry Siebert and
? Siebert who played for Aurora (Wisconsin Illinois League) in 1910 and 1911. Then I realized that in the Spalding photo, there's one guy in a different uniform (Siebert) which just has an "A" (for Aurora)? But then again, that Siebert looks nothing like the one
pictured in this PDF.