A new collection of rare and one-of-a-kind Harley creations from the 108 years of the company's existence opened on June 11 at the Harley-Davidson Museum in Milwaukee. Called "Collection X: Weird, Wild Wonders of the Harley-Davidson Museum," the exhibit will feature odd prototypes that were created as concepts but never manufactured or sold.

Most of the concepts featured early 20th century motors made by Harley-Davidson for everything from generators and lawn mowers to snowmobiles, air boats and airplane engines. Thousands of old photographs, riding apparel, goggles, belts, and other accessories are also on display. Some of the rare one-offs include:

The Cyclone Motor-Sled, "Pop's Trolley." This 10-foot-long canvas-covered spruce sled is one example of the many uses found for Harley-Davidson motors over the years. The motor-sled was sold as a kit by the Mead Ice Yacht Co. of Chicago in the Thirties, and this prototype was powered by a 1925 H-D JDCB 74-cubic-inch V-Twin. $38.50 bought the entire sled, except for the countershaft, propeller and engine. Some sleds were powered by Harley-Davidson motorcycle engines from the owners' motorcycles that weren't being used in the winter.

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