Owen_Dyneto wrote:
Beginning with postwar production in 1946, it's not all that common that the Briggs and VN match, sometimes differing by hundreds. The closer you get towards the end of the 23rd series the closer they become, often within 25 numbers of each other, and sometimes actually matching.

Beginning in 1951 they almost always match, exceptions are rare and when there are exceptions they usually are RHD cars, one-off cars, etc.