Gettinold,
sorry, can only guess.
The Central figure the 3 digit numeral, say 103, the zero is where Her Majesty'd lips / mouth are.
As is the first numeral of a 2 digit number, and it translates flipped the other side. In your case a 7.
I am guessing 72 but only that, a guess....... 14% accuracy
Cannot be Plate 70,75, or 77.
Here is Plate 89, showing easily the locations.
