How do I find out when and where my T was built. It is serial number 12726473.
"When" as when the engine was built and stamped is easy, it was November 16, 1925 and it was likely put in an early 26 model T some days later (or weeks if the assembly plant was distant).
November 16 was the first day when 100% of the production got the reinforcing straps from the new hogshead to engine bolts down to the crank case arms.
Sometimes (rarely) the assembly plant where the car was built can be seen by a stamped code in the body subframe of some 26/27 closed cars (not Fordors)
Other times such info has been seen stamped on floorboards.