What Gadge said....:)
The carby will be accurate or close enough for your mower as its definately G3 as stated. The letters C circling Z is simply the manufacturers name, CERTZINC" And does not determine its model Type.
So don't worry,as your carby is of the correct type and accurate enough to use in your restoration.
Now hopefully with the confusion aside, you can get to building that engine! Lols.
