I have a 1945 essential civilian chief that is pretty much original with very little plated parts and the unskirted fenders and chain guard. I have seen on the internet some 1945 chiefs that are said to be essential civilian models that have skirted fenders and chain guards, along with more bright trim than mine. Is there a point in 45 where they started upgrading these bikes to the skirted sheetmetal or were these bikes just upgraded?