Posted By:
will watsonhttp://www.maineantiquedigest.com/articles/honu0298.htm
i'm sure most have seen it, but if you haven't it provides an interesting read.
a quote from the article: "The card will be sold with a letter of provenance from Mr. Jesse Hathorn's daughter and a vintage family scrapbook from 1900-15 with many baseball photos and articles."
seems to back up the date of Hal's Wager.