I found this bike and it was confirmed to be Duncan Riffle's.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290274313417&ssPageName=ADME:X:RTQ:US:1123
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290274313417&ssPageName=ADME:X:RTQ:US:1123