Delco R1128:
http://www.nostalgiaair.org/PagesByM...4/M0022574.pdf
If YOU had the secret decoder ring, you'd know that you look for Delco under United Motors, look for Motorola listings in the Sams index under Quasar, Bell under Raytheon, etcetera, -etcetera... they didn't want to it be TOO easy!