Ford Model T (4th generation T4). Changes were made during the 1923 calendar year so models built earlier in the year have the older design while later vehicles have the newer design. The taper of the hood was increased and the rear section at the firewall is about an inch taller and several inches wider than the previous design. While this is a relatively minor change, the parts between the third and fourth generation are not interchangeable.

The Ford Model T (colloquially known as the Tin Lizzie, Tin Lizzy, T‑Model Ford, Model T, or T) is an automobile that was produced by Henry Ford's Ford Motor Company from October 1, 1908, to May 26, 1927. It is generally regarded as the first affordable automobile, the car that opened travel to the common middle-class American; some of this was because of Ford's efficient fabrication, including assembly line production instead of individual hand crafting. The Ford Model T was named the world's most influential car of the 20th century in an international poll.

Model T engines continued to be produced until August 4, 1941. Almost 170,000 were built after car production stopped, as replacement engines were required to service already produced vehicles.