I think you are mistaken re the number mounting. I went back through my pictures from MOG2011 and found a picture of the car in the Concours.


The number is mounted using the standard wing stay. The flattening you observed is most likely Pickersleigh Rd generated.

[Linked Image]


Here is a cropped image ( a bit fuzzy but it helps)

[Linked Image]


Paul
Costock, UK
Plus Four 75th - Furka Rouge - Pip
Disco 5
Teddy - 17h1 Irish Draught cross