While there is only one place to find the engine code and number, the chassis
number (also called VIN number) may be found in various places on a Type 4. The
example car used in the pictures below is a US-spec 1974 412 wagon.
Chassis (VIN) number
All models and markets have a small aluminum plaque in the front trunk,
located above the right headlight. This plaque contains the chassis
number and a few other tidbits.
For some markets, such as the US, the chassis number was stamped onto
a small plate and mounted onto the dash, visible through the lower
left corner of the windshield.
Some markets, including the US, mandated stickers with chassis number
and emissions information on the b-pillar. The sticker is visible
underneath the door catch on the drivers side.
The most inconvenient place to look for the VIN number is under the
rear seat. If you pull up the rear seat, you will find the number
stamped into the body at the center of the car.