There must have been a connection between the printer of this postcard, Fairman Company of Cincinnati and New York, and Gibson of Cincinnati. The art on this postcard (and another similar card the same seller had up for sale) is oh-so-similar to a couple of shades shown on page 44. In doing cursory research I haven't unearthed a connection, but wouldn't be surprised there is one.
04/14 Update: Thanks to the sleuthing of a regular reader, CR, who also loves to explore the nooks and crannies of connections between manufacturers of early Halloween, there does appear to be a firm connection between Gibson and Fairman. CR found a publication called Where to Sell Your Manuscripts by E.F. Barker copyrighted 1915. On page 46 is a listing of post card and novelty makers. Fairman is listed at 200 Fifth Avenue, NY. Gibson is also listed at that same address. Additionally, CR found another publication, Directory of Directors of the City of New York 1913-1914. Charles R. Gibson is listed as being president, treasurer and director of CR Gibson & Company; treasurer and director of Fairman & Company and treasurer and director of Gibson Art Company.