GM General Motors Proving Ground Sign 1948 Milford MI

This is an original, 40" x 52", 1948?,(The last number on the date is not legible), General Motors 1268 Acre Proving Ground Map Milford MI, Cardboard Sign, probably from a GM Dealership or Factory? Sign showes the Skid Pad-A level circular concrete surface, The Bath Tub-A concrete trough 1000 ft. long filled with water, The 27% Concrete Test Hill, The Belgian Block Road, built of granite blocks, The Straightaway-1.36 mile long concrete road, The Speed Loop, and The Durability Hill Route. The Facility was used extensively for testing New Models of GM Cars before they were placed in Production. Sign is framed in a wooden frame which is nothing special! Sign has a 17" crack (not all the way thru), a bit of staining and skinning. Overall condition is good to very good. Sign can be shipped with or without the frame. Shipping without the frame would be less expensive. Buyer pays $50.00 US s/h to US and Canada from Canada. Insurance is included. We do ship World Wide, shipping and handling will vary.