Hi Rich,
Thanks for coming in on this.
These cartouches are applied gold in the Koftgari manner and worn in places but the incised lines are still present so I am remaining hopeful that there is a method/s that highlights any residue in the grooves to offer a better outline of the writings not seen to the naked eye.
I am going to the stamp shop for a black light to see if this suggested methods works too
Gav