911 identification help?

[overjump]

Sorry... posted on wrong forum.

Hello all,

Need a bit of help. I have run into a 1975 911 that I am interested in buying but need some help identifying the original specs of the car.
The Car appears to be a Carrera. It is advertised and labeled as such, and owner claims it is an original Carrera. It has the wider (original as far as I can tell) fenders, spoiler, whale tail, etc. The car has a bit of work and upgrades done to it like the large oil cooler, 16x7/8 wheels, Weber carbs, headers, and a few others.

But here's my issue, the vin number starts with 911520xxxx, which according to my research is for a US 911S Coupe.

My question is on the authenticity of the Carrera labeling. Was there such a thing as a Carrera option for the 911S? and it it possible to have an actual real 1975 Carrera with a vin number that identifies it as an S? or can I assume this is a 911 S that someone at some point converted to a Carrera?

I'm not too familiar with the older 911s so any help of info would be greatly appreciated. I should also mention this is a US vehicle.

Cheers,
Jose M.V.

[Arbola]

The Porsche 911 Red Book 3rd addition states: "the first thee digitswere the mod.#
the forth digit was the year, the fifth digit identified engines as follows: 1= 911, 2=911S US, 3=911S 4= Carrera US, 6= Carrera, 7= Turbo. The sixth digit was body style: 0=Coupe, 1= Targa. The remaining four digits wew the individual build numbers in sequential order."

You need to get the Red Book. www.motorbooks.com