Hi there and welcome to Electronics Point
I've been unable to find any technical documentation on the UH-1. It looks like it's obsolete now. There is documentation on other UH- series devices but it doesn't tell you which wire is which; it only covers the original plug:
If you want to figure out which wire is which, you'll either have to dismantle the headset and find out where each wire goes (and upload photos) or try to figure it out using a multimeter and a battery. Do you have a multimeter and do you know how to use it?