Great pics Neil. Those ET forks look awesome. PM'd about the decals
I just thought I'd chip in here with a couple of things for reference...
My round tubed Kuwahara TRX don't have the internal 'Helicoidal' 'Spiral Superstem' like the oval tubed TRX
The ovals also have a slight flat edge along the front and back of the tubes.
Both sets should be Tange stamped & dated on the stem. Ads from 80 & 81.