From 1925 to 1933 Willys-Overland produced their Great Six with a Knight-licensed sleeve valve engine. These were produced in five distinct series names Model 66, Model 66A, Model 66B, Model 66D and Model 66E.

In 1929 Wills offered a Plaidside paint scheme with bodywork by Griswold of Detroit.

Auction Sales History

1930 Willys-Knight 66B ‘Plaidside’ Roadster – did not sell for $85,000 An iconic American roadster of the Jazz Age. One of only 13 known survivors; a CCCA Full Classic. Known history from new; over 40 years of single-family ownership. Accompanied by original brochures and fascinating correspondence. Auction Source: 2014 Motor City Auction by RM

image: http://www.supercars.net/gallery/119513/3111/1085894small.jpg

1929 Willys-Knight 66B Griswold ‘Plaidside’ Roadster 44458 – sold for $264,000 An iconic American Roadster of the Jazz Age. One of only 11 known survivors. Meticulously restored and award winning. CCCA Full Classic. Auction Source: Amelia Island 2014 by RM Auctions

1930 Willys-Knight Great Six Plaid-Side Roadster – sold for $220,000 Unique Plaid-Side Design. Beautifully and Extensively Restored. Shown at the Pebble Beach and Meadow Brook Concours. Multiple CCCA and AACA Award Winner. An Eye-Catching and Stylish Favorite of the 1930s.
Auction Source: The Amelia Island Auction 2012 by Gooding & Company