I was browsing Craigslist and noticed this 1905-1908 Wheeler and Wilson D9 for sale with a great price but a little too far away. The original owners manual has been over stamped Singer Manufacturing Co. on front and back cover. Apparently done to use up the old manuals and/or used until new manuals could be printed. Nothing spectacular but a great sewing machine.
http://richmond.craigslist.org/atq/4587772400.html
Singer 1908 Catalog labeled "Wheeler and Wilson 9 W 1"
http://needlebar.org/manuals/singer1908catalogue.pdf
Replaced in 1909 catalog by Singer 9W with Singer decals and made to fit Singer cabinetry:
http://needlebar.org/manuals/singer1909catalogue.pdf
The W&W D9 or 9W1 was Singers first rotary model.
Jon