These comments are for a TR4 though perhaps a TR4A is similar...
The number most vehicles are registered with is the commission number, found on the black & aluminum plate over by the master cylinders. The number will end with an 'L' for left hand drive cars and additionally an 'O' if the car was originally equipped with overdrive. That plate may also indicate interior color code and paint code.
There is no modern VIN on these cars.
Over on the passenger side there is a plate showing the body number -- close too but rarely identical to the digits in the commission number.
There may or may not be a STC plate indicating the model year of the vehicle.
The one other number often referenced is the engine number, stamped on a boss by the coil. Like the body number, its digits are likely near to but not identical to the commission number. When I say 'near' I mean within a few hundred though the difference can be much more (several thousand) and still be correct.