926-96459 does show up on Chevrolets 1970 paint code list as code 19 Tuxedo black too.
Every single regular color was assigned a production code.
Why Van Nuys Plant didn't recognize it as
19 is beyond me.
Maybe it being an early built vehicle,they were not familar with the new paint code of 19 being changed
from code 10 from the previous year,so they went with the longer production code number instead.