Ford CMP door markings

[derk derin]

Hi All,
I did some sanding of my Ford door last night and came up with;
A-19-C.A.S.C.T.C.
L
____

64-713
Does anybody recognise the markings and where the truck might have been used.By the shape it is in,not in the bush driving over trees! The truck came with a post war army flat deck,with Canadian acceptance stamp and a 1964 date on the data plate.Would the date on the door reflect when the truck went through it's change into a flat deck with removable sides?
I would take some pictures but don't yet know how to post them without my sister's help and she is in the hospital right now having a baby so when that task is over I will get her to post some pictures for me in a couple of days!
Derk.