Brain-Teaser 467

From The Sunday Times, 10th May 1970 [link]

There was a christening at our house last Sunday and there were three visitors’ cars in the drive.

The car registration numbers of these three cars (disregarding any letters) each a three-digit prime number and among these numbers each of the digits 1 to 9 was used once only.

This in itself was quite remarkable, but the sum of there three three-digit primes gave the three digit registration number of my own car.

What were the three registration numbers of the visitors’ cars?