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That's the anti-theft number and is done that way to make it impossible to grind off and re-stamp. However, it has little or no significance for registration purposes.
Owen_Dyneto has been compiling a database of body ID or theft proof numbers for years and I am sure would appreciate your info along with the vehicle number and motor number if you would care to share. You can send him a PM with the info if you would prefer not to post the data. If you are logged in here is a link to his profile where you will find a Send Message button to link with the message page.
https://packardinfo.com/xoops/html/modules/profile/userinfo.php?uid=177 Don is correct that there is no practical use for the theft proof number today as it was a number used only by the factory and almost all the records to tie a number to a particular car -- save a few that have surfaced over the years on dealer cards -- has been lost.
While not officially used for registration purposes, since it is the only number on the car that is not on something removable, sometimes an inspector will choose to use it if a car is being registered and is out of the system and old paperwork is lost. Upon inspection by DMV or other officials that non removable number has been declared more than once to be the official number and from then on appears on current registrations. My 47 is such a car that fell into that exact scenario and had the body ID number assigned by the inspector from the California Highway Patrol as the official number.
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