My 81 SD was a Euro delivery car. The MB service phone number in the glove box lid was a number in Austria IIRC. The records indicated the things they did to Federalize the car when it arrived in the US. It was minor things.

The format of the VIN will tell you if it was meant for US or Euro delivery, as will the language of the various decals around the car. If there's a manufacturer tag on the driver side B-pillar claiming the car conforms to DOT requirements, it's a US-spec car.

Most telling thing I can think of is EGR. I haven't seen a Euro MB Diesel of the 80s to early 90s that has EGR.

Sixto
95 S420