In all likelihood the prefix on yours will be 67, but being so close to the end of the year it may also be 68. Somewhere in my mess of papers I think I have some of the old Crown Assets sales sheets which might give a breaking point for the 67/68 prefix. I believe the prefix had more to do with when the vehicle was taken in to service than the year it was built. I had seen commercial vehicles with the next year prefix assigned to them; not often but it did exist.
I have seen numbers very similar to that used on the plates available at various hardware stores.
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