Breaking out some old stock...

CZ93X62

Official forum enigma
No more wooden tray primers here, they got used up years ago. The probable oldest primers I have in use now are some CCI #300 (LP) in the green/white/black boxes and sliders, not sure of the packaging vintage but I never saw them on a retailer shelf, and started paying attention c. 1970.
 

RicinYakima

High Steppes of Eastern Washington
I believe that is the packaging just prior to them being bought by Speer, early Viet Nam era.