I showed Tony from Autobahn Interiors a picture of my car's doors and he immediately said "That's a 1966." We bought the car in about 1993 and always knew it as a 1967 car because the
owner's driver's manual and the registration both say 1967. When I looked up the VIN number a few years ago the site I found said 1967.
I was also curious about why the gauges were in German text with metric units. A friend of mine works at Porsche so I asked him about it and he said the car was originally sold in Frankfurt. That answered that question and I didn't think about it again. Until I heard "That's a 1966." and then went to Luftgekült and started getting more and more curious about this vehicle.
Here's the body tag in the trunk area:
Another friend, one might say a scion of automotive information, looked this up and said his source calls it a 1966. Plus, there are cars on the market with higher numbers calling themselves a 1966.
Anyways, this is the color tag in the left door frame. I didn't even know this existed until I saw it mentioned in the driver's manual. It was covered in paint so I chipped some off.
Looking up that color code shows it's silver! The car is obviously not silver, but it's also pretty plain to see that it's been painted red. In a number of places where the paint's chipped you can see an orange color. This looks like the "tangerine (aka blood orange)" color but that wasn't introduced until 1968 - two years later. http://cprclassic.com/reference/colorcharts/911.html
(I know it's impossible to tell colors this way, but take my word that it's orange compared to the deep red top layer.)
However, in other areas, the paint chips show a grey color underneath. I always assumed that was the primer, but with this new information I'm thinking it may be the original silver color. (Also note the North American tail-lights - these would likely have been replaced at some point so they don't indicate anything other than which way I'm turning.)
Here's a sample of where the manual and the car are not in sync - the washer fluid reservoir. Note how it's "built-in" in the manual but attached with a hidden bracket in the car. That's not a detail someone would casually replace or redo. The manual, where it mentions gauges and in its power specs, uses English units. Plus, it makes no sense that a car with German gauges and metric units would be in English. This makes me think that the car's age was misrepresented when it was first registered in California. (See edit below)
Notice how the fillers are completely different (nevermind the dirt)?
Gauges in metric - those are kilometers on the odometer (which is stuck).
One must have sufficient drucks to drive. And I'm not sure why the oil level goes from "Liter" when empty to "Quart" when full.
In addition the ignition is European spec.
I always wondered why Porsche would include this hole. At Luftgekült I saw an old 911S with a rear window wipers for the first time, but when I checked out other decklids on cars without rear window wipers they didn't have this hole...
When cleaning the bottom of the decklid I noticed more wires going in than was needed for just the license plate lights and pulled this bundle of cut wires out from under the bracing. This car did have a rear window wiper! It also explains a couple of unaccounted for holes in the bottom of the decklid. I'm guessing the rear window wiper is controlled by one of the knobs on the dash that I never have figured out the purpose of.
Finally, serial numbers on the engine and transmission. I haven't done any research here but they don't match the number on the body. (See edit below)
And, since I've shown so many unflattering pictures of this work in progress, let me finish it with this beauty. She runs as good as she looks!
So I chatted with my mechanic today, John @ Dieter's in downtown San Diego, and he said that there's no such thing as a 1966 911S. He said that Porsche was a really small company back then so probably what happened is they had spare parts from '66 that they used on the low number '67s, including even the bodies and door trim. He didn't say it but my conclusion was that anyone calling their 911S a '66 was being precious or choosing to ignore the difference between manufacturing year and model year.
I mentioned the engine serial numbers and he said they wouldn't be the same numbers as the body, that I could get the original numbers from the factory. He said when the car was in the shop he ran the serial number on the engine to make sure it was an "S" engine before he started working on it and it was.
Also, he said if I really wanted to get to the bottom of this I should talk to the guys at CPR Classic.