According to a catalog from Anglo Parts in Belgium that specializes in 1958-64 Sprites/Midgets, they refer to body number as the one on left door post. They make no acknowledgement to the BAE number on right door post.
My Bugeye has a vin of AN5 479XX and wasnt titled until 1962.
Doesn't matter... that is incorrect, at least when it comes to the Bugeye. BMIHT doesn't track that number and it's pretty much meaningless when it comes to determining when anything specific about the production date of the car,.The information about the BAE number presented previously is factually correct for the Bugeye, but not MKII's as the prefix changed, and the location of this significant tag moves to the left side. Prefixes for the MKII Sprite ABL, and for the MKI Midgets GBE. This is also documented by Terry Horler in the book
MG Midget & Austin Healey Sprite: All Models, and can be previewed herein greater detail, including later models.The number stamped on the top of the footwell box, near the firewall was not recorded either. As stated earlier, they are usually somewhat close, but there is no pattern to it other than being within approximately 1000 number sequence apart.
One of my Bugeyes came to me without any data plates except the two door plates. When inquiring with BMIHT, on determining the chassis/VIN number back in early 1997, I received a personally hand written note from former archivist Anders Detlev Clausager, stating that he could provide the original chassis number if I could provide the BAE door plate number. So, you can take that bit of information "to the bank". Anyone who has a BMIHT certificate for their Bugeye will see this number recorded on their certificate, but not the other door plate number.
Historically n the US, import cars were "dated" by when they were sold, not by when they were manufactured, so other than to the DMV, it has little validity as to the year,and model. That has since changed. Furthermore, there are probably many instances when a title was lost and someone guessed at what year it was. As proof of that, I own a mid-year 1960 production Bugeye that is titled as a '59.
P.S. 479xx is approximately an October 1960 manufacture.