Artn Turns, how to tell one from another

[packerbacker44]

how do you identify Artin 1/32 scale turns, I'm having a hard time finding the markings on them, where do you find the R1,R2,R3,R4, ect. I'm missing something.
thanks for any help out there!
PB44

[HomeRacingWorld]

The R terms were ones that we used to describe the radius. R1 being the tightest through R4 being the largest. They were not stamped on back.
There are stampings under the track near the inside edge, but cannot remember the number codes for each.

Just lay the sections out and see which ones fit inside one another. Pretty soon you will be able to spot them by eye.