Notes on O series 20/25

Commencing at chassis number GXO11. The series runs from GXO11 - GXO111. The first 20/25 to come off test appears to be GXO15, 28/08/29.

Apart from the engine bore size being increased to 3 1/4" the chassis and running gear was similar if not the same as the earlier 20hp cars.

Filtered parts list by Section