[John Brown]

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And what does WBHP on the front fender mean ?

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WBHP is most likely the call letters of a radio station that helped sponsor the car.

Here's a little trivia about WBHP from Wikipedia.

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WBHP was the first Huntsville Alabama AM radio station. The station went on the air as WBHS on April 22, 1931 as a service of The Hutchens Company. The station became WBHP in 1937. <font color="red">Oddly, the Federal Communications Commission also briefly assigned the WBHP callsign to a low-power South Carolina station in 2000-2001.</font>

WBHP had been through several owners until its acquisition by Clear Channel Communications, its current licensee. The current call letters stem from longtime previous owner Wilton "Buster" Harvey Pollard. Until the November 1997 switch to all-news, WBHP broadcast a country music format.

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So, it looks like there may have been a WBHP radio station in South Carolina for a while also, just to muddy up the water a little more.