Gary,
If you want to split hairs and get it EXACTLY right, I'm willing to help out in the hope that you may have a skill that I need sometime.
I am a CAD Draftsman, and I operated a graphics/sign shop for years.
I will do you an AutoCAD drawing that the stamp guys can work from, that's exact.
Here's what I need:
1) O.A. Ht x Ln of YOUR coil stamping, say to the nearest 0.010"
2) 10 closeup shots of YOUR coil stamping, perpendicular to the coil, each 1/10 of the way around the arc that the stamping falls in
3) The date code that YOU would like to have
It will probably take me about 2 hrs to import the 10 pictures into AutoCAD and draw each letter with the same font and spacing. Then I'll send you a disk with the AutoCAD drawing and a DXF file for the stamp company.
As I said, maybe you can help me out with somethin' I need in the future.
Bryan