Found the correct font for my data plate .What I can work out from the Orchard and Maddon book mine is contract C9310 Cat No 30 which is identical to the plate I found on the internet.............. shame its not for sale its part of someones restoration :face_with_rolling_eyes: .
I have some 5mm stamps (numbers) of the same font but not the 3mm , so I'm scouring the net to try locate and purchase the correct size .
I don't know if yours will be the same font ,it was a lucky find coming up with the identical contract as mine , I think I've found the stamps with the correct font .