Thank you all for the answers, impressing knowledge out there!
I will show the rh front framerail because I thought it was remarkably "old" or isn`t this a date stamping?
"Old" is relative IMHO you would need to to have a sampling of other cars built at the same plant and time and compare that exact same panel to the dates found on the other cars to evaluate a specific panel. Good thing is that the date code range should not be looked at as individuals but as an over all pattern along with other indicators. In this case this is a panel shared with all body types that year so there was a high volume of them made and possibly in inventory because of that fact