A "H" wheel was the heavy-duty wheel available on many B & C-bodies including police cars & taxi cabs. They (15x6.0") were STANDARD on A12 & HEMI cars in '69. The "H" wheel grew to 15x6.5" in the '70s. The dates & manufacturing plant info are usually stamped before & after the valve stem hole. It was replaced by the 15x7.0" 6-slot "cop-car-wheel" in the mid-'70s.