Obviously based off his E120/W573 card...
http://www.ebay.com/itm/1922-E120-Am...item2c88de5c49
Most likely from the W573 given the black and white coloration of the piece.
About the piece itself I am skeptical of its authenticity without having it in hand to examine. If however it is from the period it looks like someone had it made based off the card (hence the carryover round ornate frame.) It is likely a fantasy piece or possibly (again if period-- which I am doubting) could have been made by Gillespie himself to give out? I doubt any more information will be forthcoming. Do you have a picture of the back, which I assume is blank?