I guess I mis-understood the last part of the VIN then. I thought it said the last 5 numbers were the production numbers - will look at it again!
Also my receipt from the first servicing shows the delivery date (to me), but not the build date.
Well, the last 5 numbers are
the production numbers, plus the sixth digit (from the right). Think of the A as a 0, B as a 1, C as a 2, D as a 3, and so on. Using a number in that sixth digit allows for only 999,999 total vehicles, but using a letter allows for 2,599,999. While that may seem high, Ford sells over 1,000,000 F150s every year, so a letter makes perfect sense. That's also why letters are used on license plates - three digits of only numbers = 1,000 combinations, but three characters of numbers and letters = 46,656 combinations.
So, for example, A12345 was the 12,345th vehicle built, and C12345 was the 212,345th vehicle built.
The last 8 of my VIN are 6KA53*** and although my service invoices from the dealer never show the build date they show the in service date as September 15, 2005. How early do they start production for the next model year? I can't see the build date bieng too far before September of the previous year.
Production of a new model year usually starts several months before the official introduction of the new model year. In your case, over 53,000 E/M/Ts had already been built before September 15. Actually, when you think of the number of dealers that need to be stocked before October 1, that's about right.