The Super Tourer that I am familiar with was cataloged from 74-76 and would not have come with the Japanese components you mentioned. Also, the braze-on's bottle bosses etc would not be correct for those years so possibly they were added prior to the Cycl-Art repaint. FWIW, the (replacement) DT & CS decals are of the type that was used during the aforementioned years.
I can't tell from the pic if it has a sloping fork crown, but if it does, I can't rule out the possibility that it was a Super Tourer.

Whatever it is, it looks like a really nice bike, so if you have the opportunity to repurchase it at a reasonable price, it would be a lovely addition to your stable.