An exceptionally clean example of a 1940s Harbor Petroleum Products porcelain sign with seaplane graphics and two rare and desirable vintage motorcycles, a 1939 Harley-Davidson EL Knucklehead and a 1947 Indian Chief Model 347B, will come up for bid Wednesday and Thursday, July 15 and 16, at Morphys Automobilia, Petroliana and Soda Advertising auction. Among other expected stars will be highly collectible vintage signs for OK Used Cars, Mohawk Gasoline, Sinclair Aircraft, Ford and others. The auction is loaded with nearly 1,300 lots of motoring-related signage and service station items certain to please even the most discerning collectors. The event will be held live at Morphys Pennsylvania gallery, with all forms of remote bidding available, including live via the internet through Morphy Live. Many of the higher-estimate lots will be offered on day one, the July 15 session. Top among them is the ca. 1940s Harbor Petroleum Products Co (Los Angeles, Calif.) porcelain sign with seaplane graphics. The sign is graded 9.0 by AGS, the premier authentication and grading service for antique advertising. It shows full color and gloss throughout, with no noticeable chipping in the inner or outer fields. This sign has great display power and is a true icon of early California petroleum history. The 1939 Harley-Davidson EL Knucklehead was a legendary motorcycle famous for establishing Harleys OHV V-twin legacy. The 39 model year is prized by collectors because, with this model, Harley-Davidson successfully resolved its early oiling issues that plagued earlier models. The 61-cubic-inch (1000cc) engine could achieve speeds up to 100 mph. This is an older restoration. The bike appears to be mostly original, with minor chrome accents added later. The 1947 Indian Chief Model 347B was Indians iconic heavy weight big twin motorcycle, famed for its sweeping skirted fenders. It was a larger, more powerful bike than the smaller Scout. This is believed to be an older professional light restoration, possibly an original paint with very minimal touch-up. Its graded 8.75-plus for condition and is Deluxe Jet Black in color. It has been actively used and very well-maintained and is in above-average condition for its age. An antique, ca. 1910s Mohawk Gasoline Down Feathered painted wood delivery panel wooden sign is a rare piece of Bakersfield, Calif., and Mohawk history. Until recently, the only known examples of Mohawk Down Feathered advertising pieces were the 30-inch porcelain sign and the 16-inch porcelain paddle sign. This piece was recently discovered in San Francisco. A departure from petroliana, but no less important, is the Aetna Insurance Company single-sided reverse painted glass sign with early automobile graphic and original wood framing. Its an amazing piece with only a few original examples known, and graded 7.75. This is an exceptional piece of early graphic automotive advertising. A scarce Sinclair Aircraft one-piece baked globe with airplane graphic is dated February 1929. Its a beautiful piece of advertising and one of the greatest globes ever produced. Overall its excellent, showing bright colors throughout on each side, with only light surface wear. A high condition grade of 9.0 certainly doesnt diminish its desirability. Dont sleep on day two offerings. One example is a Griesedieck Bros Light Lager Beer double-sided die-cut porcelain hanging sign from the 1930s, manufactured by Kirn St. Louis as marked on the bottom edge. Its a beautiful die-cut sign with bright colors and one of the best-known examples and graded 8.5 for condition. For additional information, call 877-968-8880, email info@morphyauctions.com, or visit www.morphyauctions.com. All images courtesy of Morphy Auctions.