Citizens in Florida is asking for the date of the latest update on this old Federal Pacific panel.
After a carefully reviewing pictures if found “J1977” Stamped on the paper Legend. Would this be evidence of the latest update? See first pic.
2nd pic is from inspectapedia with a similar looking number G1478
This makes me think it is month/year. Other than this after lots of research I cannot find a definitive “date of manufacture” website.