The fourth design took that Sakuyama chassis and engine and replaced the steam system in late 1923 with Charles A. French's patent design. The French-Coats was technically the most superior, probably the most likely to have been functional, and the car used in photographs.
This particular car design incorporated Sakuyama's chassis and engine, and by late 1923, it had been upgraded with Charles A. French's innovative steam system replacement, which was probably the most advanced technology available at that time.