Thanks! It looks like (based on a sample size of 4) that on the 250SL Euro, the only VIN data plate is under the hood, not the driver door jam - mystery solved!
My 250SL is a US (not EURO), early - SN: 989, and on the model, the VIN dataplate was on the driver door, and under the hood, so I expected the same on the EURO - another piece of history!