Kevin, Congrats on your pipe, it's a beaut!!...I was watching it. I think I recall seeing one in a Leland's auction about 15 years ago. I believe I've seen at least one other vintage baseball pipe that was later than yours that had a baseball for the bowl. But I'd consider yours the best of any I've seen. I only have a vague recall of the one I think I saw in Leland's. I figured for sure the bowl would have been a baseball....but Demuth describes it in the patent as a "Globe". You sure dug up some GREAT reference.
I have the football pipe below. I've never liked that mine has "The Rugby Pipe" name on the side since I'm usually only interested in American sports...Nevertheless I'm convinced it's American because of the quilted over the knee pants.