Are you talking back in 1975 for the A-series, or the UK permanent NVIs in the 80s?
BTW, make as much sense as the ONE PRICE PRIORITY MAIL or EXPRESS MAIL cartons.
It's funny that we're gone back to NVIs after so many of us used them in our childhood playing "post office". But with the economy the way it is, it makes sense.
The No Value is one idea. The Forever Good for First Ounce of FCM is a newer idea.