I found my original case at a friends farm sitting on a pile of junk from his grandpa's 65 mustang. When I got home and dusted off the case, I saw the faded original stamp.
After media blasting up the case, I swapped guts from a donor Alt from NAPA, stripped off the black paint on the center section "ribs" and repainting them amber, and restamped it EXACTLY where the stamp was (If you held it at an angle to the light and your mouth just right you could still see the original stamp).
The stamp was on top. Just like the AMK repop on their web site.
Thanks Stacy and Bob for the help and advice!
If someone wantes to post how to post a pick I will he happy to or I can send them a picture of my restored 65 Alt.