This card was part of a large postcard lot in a recent auction. It is a Rose Co. postcard but not a PC760. It is a 1909 era homemade card similar to the Springfield postcards that surfaced in 2004 and again in 2013. History of these type cards and other samples can be seen under the Postcard Variations section here:
http://www.sportscollectorsdigest.co...pany-postcards