Question about the WWI Baseball Jersey??????

[ham1963]

Does any one know anything about this jersey? Was this a semi-pro team back in the 1900's or was it a military team?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=016&item=260034324284&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1

Thanks,
John