Hello again wce
I can't really add any more to my previous post and what others have said, but can confirm again, from my records, your serial number and photos it is a Mayfair 68-69 Deluxe 2 Model 559 (Victacode V76), it does have the correct chassis base and a G2 Carburettor.The catcher is listed as a model 15 and is plastic.
Although, I would be interested to know where the white extension cable goes? I'm not familiar with this model, but it looks like a cut out switch lead (for magneto earthing), others may wish to comment on this.
Mark
