Post 87 is the only guy who mentions a pat. number but it's a trapazoid type, not square. My LA car has a square mast but not dated like yours. Interesting....Joe
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1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E
1970 'cuda Moulin Rouge, 440-6, 4 speed
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