It's too bad that Rootes didn't do secondary chassis number stampings on the chassis! BMC started in late 1963. Imperial palace sounds like a quasi museum or dealer... Little lower on the food chain than used car dealers... well.... insurance salesmen, vacuum salesmen (door to door) and politicians!! I have told my clients for years, if it looks too good to be true, it is, and... if you see a chassis tag that is obviously wrong and attached the wrong way... do not let go of your wallet! Pretty easy to get a title in a lot of states with little to start with.
There has been a lot published about chassis tags and the fonts used, but the single biggest red flag is that the zeros on the chassis number line (the first 2) are actually lower case O's" and not numbers at all. If all of the zeros are the same size, no matter how good the tag looks, it's fake. There should be three different fonts on the chassis number alone. The main body, the lower case "O's" and the final digit (or 2 digits) stamped by Jensen. The tag was supplied by Rootes with the majority of the chassis number already stamped (including the suffix). Jensen stamped the last digit (or 2 digits) of the chassis number, the engine numbers and the paint code. The fonts on the engine numbers and paint code are the same font that Jensen used for the body number tags on the Big Healey. The JAL tag was stamped by Pressed Steel and painted after being attached to the body with slotted #4 pan head sheet metal screws. (so you'll find primer or bare steel under the JAL: tag of an original car) Whoever made the chassis tag knew just enough to be dangerous... They figured out what the engine prefix number should be, but had no way of knowing the market spec. as the ledgers don't tell you that... (HRO/LRX) That the car was body #58 means that the color probably wasn't Carnival Red, but again, there are VERY few notations for color in the ledgers...
Still, I'd like to know the whole story of the JAL tag and where it came from....